I have two Hatsan precharged pneumatic (PCP) airguns – a full size Gladius .22 long and a compact ATP2. I recently needed to replace the O-rings and started researching what was needed.
The O-Rings
Here’s a Hatsan probe and the brownish/tan O-rings are their OEM rings. The black rings are the Buna-N rubber rings that we are now selling.
My two Hatsan’s get pressurized up to 300 bar, which is 4,351 PSI. That’s quite a bit of pressure that the fill probe’s O-rings need to contain plus they need to be flexible enough to allow for insertion and a good seal. One last consideration is the need to withstand the silicone grease that is used to lubricate them (never use oil-based grease on a PCP or it may diesel under pressure).
The O-rings are wear items meaning they will wear out for a variety of reasons and you can tell because when you go to fill the airgun’s tank, you will hear air escaping plus you probably will not be able to get very much pressure to stay in the line. So when mine went out and I installed the spare set that came with the Gladius, I had to think about getting more spares. Hatsan was out of stock at the time so I decided to dig.
So, I started researching what O-rings would work best and sourced some that work great. They are 70A on the shore hardness scale and made from Buna-N rubber which will withstand the silicone grease.
In addition to fitting Hatsan PCP fill probes, they will also fit the Air Venturi Halestorm, Evanix, FX, Hammerli Pneuma, Kral, Lgun and Raider probes.
While I was at it, I decided to tackle how to keep the probe clean. I’ve had my Hatsans and my Hill Mk4 air pump for a couple of years and have tried to keep bags on the probe to keep it clean. Those semi-rigid airlines flop everywhere and trying to keep dirt off the probe that is sticky with silicone grease is a challenge.
Here’s the uncovered probe begging to have dirt and debris stick to it.
So, after measuring stuff. I came up with two types of caps for people to choose from. The first is a yellow cap with a pull tab.
Here’s the yellow pull tab cap that extends just past the rear O-ring
If you find this post useful, please share the link on Facebook, with your friends, etc. Your support is much appreciated and if you have any feedback, please email me at in**@ro*********.com. Please note that for links to other websites, I may be paid via an affiliate program such as Avantlink, Impact, Amazon and eBay.
Hatsan is a Turkish company that was founded in 1976 and makes a number of airguns as well as shotguns. My first Hatsan was .22 Long Gladius Precharged Pneumatic (PCP) bullpup air rifle. The Gladius is amazing but I really wanted to find something smaller and more discrete. Even though the Gladius is a bullpup, it is still fairly big and heavy. I started looking for something else and ran across the Hatsan AT P2 and found what I was looking for.
Hatsan comes up with some radical designs that are well thought out and executed. I was very happy with Gladius so when I saw the AT P2 and that it had their proven Quatro trigger, was a PCP repeater, used their great 10 round magazines, and had integral Quiet Energy baffles, I was pretty much sold but kept reading 🙂
I prefer .22 caliber airguns for dealing with larger pests. The AT P2 claims 780 FPS so that will make around 19.8 ft/lbs of energy at the muzzle. This matters to me because I need the carbine for pest control – chiefly ground squirrels, tree squirrels and rabbits – all of which tear up our gardens. These animals typically need about 3-5 ft/lbs to be dealt with provided accurate shot placement. This means you need an airgun that can put pellets on target in an area of 1″ or less at the range you expect.
I am typically taking care of pests within 10 yards and rarely out to 20. In digging I read reports that the AT P2 was surprisingly accurate, had a good trigger and could hit surprisingly hard with for 10-20 pellets. Unlike the Gladius, there isn’t a power adjustment plus you are talking about a fairly small 50cc air tank compressed to 200 bar (2900 PSI).
Hill Mk4 Hand Pump
Another reason for my buying the AT P2 was that I could continue to use my Hill Mk4 hand pump that really has proven itself to be exemplery. The Gladius and AT P2 use the same air fill probe so I didn’t need to worry about changing probes or buying a second pump.
I actually find the smaller air cylinder works in my favor with the Hill pump. I shoot one magazine and top it off again to 200 bar. It doesn’t take too many pumps to do that compared to a bigger cylinder where you need to put more air into the tank.
UTG 3-9×21 Mil-Dot Bug Buster Scope
So, I ordered the carbine and a UTG 3-9×21 Mil-Dot Bug Buster scope with an adjustable objective. UTG makes great scopes and I’ve used them extensively on airguns and firearms that are not mission critical. I don’t mean this as a negative to UTG – It’s just that I will go to Vortex for those situations.
The Bug Buster scopes are just ideal for this type of application. They are compact, bright, clear and pretty reliable. I’ve had a few over the years and haven’t had one break or fail to hold zero.
They have a number of models of Bug Buster scopes and I don’t think you will be disappointed in any of them. Here’s the one that is on my AT P2:
If I had it to do over, I would buy a scope that has turret for adjusting the illuminated reticle. The push buttons work fine but I prefer the simplicity of a turret – I guess I am just old school. A lit reticle can make a low light shot either early in the morning or at dusk way easier. Here’s what I would recommend:
Plano 1502 Hard Case
I already had a basic Plano 1502 hard case to store everything in. It comes with a little hard case from Hatsan but I wanted to have enough room to put the carbine with the scope attached inside.
The only con in the case of the 1502 is that it has an interior length of 50-7/8″. That is really long relative to the AT P2. I have the stock extended one click and that makes the overall length 32-/34″ and the height from the bottom of the grip to the top of the scope turret is just under 10-1/2″. The AT P2 could have gone in a far smaller case but I made do with what I had.
JSB Exact Jumbo Diablo 15.89gr Pellets
I really like JSB pellets. I’ve shot over a thousand of the 18.23gr pellets through my Gladius. I wanted something lighter to try for better in flight ballistics and less over-penetration so on a gamble I ordered the 15.89 gr pellets.
How did it turn out?
I’m really happy is what it boils down to. I needed to oil the safety lever to smooth it out but other than that, it shoots like a dream. I tell you what, it definitely takes care of tree squirrels – head shots are no problem at all and the trigger is remarkable.
One thing that surprised me is the target grip. It comes with a right hand only grip set that is remarkable comfortable. If you are a Lefty, you can contact Hatsan USA and they will send you a left hand set.
The removable adjustable stock is clearly innovative. I find it way to big to be a pistol plus I want the stability. I didn’t buy it to use without the stock. Removing the stock is simple – push the big detent button and pull straight back.
As mentioned, it is a big pistol as this next photo shows. Unless I was resting it on a fence or something there is no way I would be able to control it. If you have a lot of arm strength and can keep a big pistol steady, then maybe but not me.
The stock can adjust four clicks to be quite long. I just need to go back one click and I am 5′ 8″. The cheek piece is adjustable but I did not need to do so.
This is what it looks like for me:
It’s also remarkably quiet. I haven’t run it side by side with my Gladius to compare the sounds at equivalent feet per second but I can tell you it is way quieter than by Gladius on power setting four. I think the cocking is louder than the report of the airgun and it will put a tree squirrel down hard. Headshots tend to stop in the cranium but heart and lung shots go through the body.
Conclusion
It’s performing exactly the way I had hoped. It is compact, quiet, powerful and also very accurate. I’d definitely recommend it.
If you find this post useful, please share the link on Facebook, with your friends, etc. Your support is much appreciated and if you have any feedback, please email me at in**@ro*********.com. Please note that for links to other websites, I may be paid via an affiliate program such as Avantlink, Impact, Amazon and eBay.
I’ve been using a RWS Diana 34P for pest control for two years and wanted to get something without the recoil / spring bounce, had plenty of power, was quiet and also had a quick follow up shot. To explain two points – a spring pistol air rifle has a rather bizarre recoil caused first by the spring triggering forward and then the pellet being pushed out the barrel. This requires a particular way of holding the rifle to be accurate wherein it can actually move. This is known as an artillery hold. The other issue has to do with the follow up shot. Now I got pretty good at taking a shot, whipping the 34P around while breaking the barrel open and using a pellet pen to insert the next round. However, that all takes time and you lose sight of whatever critter you are trying to get – in my case it comes down to tree squirrels, ground squirrels and rabbits.
So, a pre-charged pneumatic (PCP) seemed to make a lot of sense to me and the first hurdle was to figure out how to charge it in a rural area. After a bunch of reading, I decided to buy a Hill Mk4 hand pump so that part was covered (click here for my review of it). The next question became, which PCP rifle to get. On the low priced, quiet, effective and very popular side was the Benjamin Marauder. The only reason I did not buy it was that I wanted something smaller. I considered the pistol version of the Marauder but wanted a longer barrel to improve energy and accuracy. I must admit that I may get one or the other of those some day in the future.
What really caught my eye was the large selection of bullpup air rifles. I’ve always liked bullpups because they are relatively compact and balance well. There are a ton of very well rated bullpups including models from Vulcan, Kaliber, Taipan and FX. I also ran across two offerings from Hatsan – the BullBoss and the Gladius. They are very similar except the Gladius has an adjustable cheek rest, recoil pad for length of pull and vertical placement, power adjustment and the magazine carrier in the stock. The plus for the BullBoss is that it is 1.1 pounds lighter as a result. I opted for the Gladius due to the adjustability.
The Gladius comes in three calibers and two lengths. Long ago I switched from .177 to .22 for pest control and knew I wanted a .22. They have a .25 model but given that I already have a ton of different pellets to test from JSB, Crosman, and so forth, I didn’t want to add yet another caliber. I learned this long ago with firearms – each new caliber brings with it a lot of testing and learning just about what works and what does not. It’s not as simple as just buying one tin of pellets and you are good to go – you need to be able to test and see what is best for accuracy and even for a given application. Also, I went with the Long model – it has a barrel that is about 3″ longer and that gets you approximately an additional 100 Feet Per Second (FPS) and 7 more Foot Pounds of Energy (FPE).
I went ahead and bought the Gladius due to the adjustable stock and power settings. I’m glad I did because I really like to get the stock just right so that when I bring the rifle to bear the scope is just where I want it to be to get a full sight picture and have a consistent cheek weld. What is also nice about the Gladius is that it comes with a fitted hard case and four magazines total.
So the rifle showed up and I immediately mounted the Hawke 4-12×50 Mil Dot AO scope and took a couple of pictures. I’ll do another blog post about the scope and rings later but you get the idea.
As a side note, guys reported that when you receive it, you can’t tell which side of the case is the top. You know what? They are right. It was pure luck that I opened mine top up. I took a silver sharpie and wrote a small stylized “T” on the top so I could find it going forward.
Now another thing I like about the Gladius is that the pressure cylinder can be swapped while under pressure. I had seriously debated how to quickly charge the rifle if I needed to. Actual PCP tanks are expensive and the spare cylinders are only $159. Interesting enough, if you look at the case above, it has a cut out for a spare cylinder under the rifle. Right now, I’m debating whether to use that for a tanks or a Lead Dust Collector (LDC) which is airgun speak for a moderator, which would be in addition to the stock suppressor that is integral with the shroud. Out of the box, the Hatsan comes with the “probe” you will need to pump air into the cylinder. It screwed right onto my Hill Mk4 pump so there were no additional adapter fees. Here is the cylinder with Hill pump:
This is the end that screws into the rifle. The supports are nicely done and guide it into position without any trickery needed.
This is the fill port. The cylinder’s gauge is on the end and graduated in bars. The cylinder and rifle are rated for up to 200 bar, which is 2900.75 PSI.
In the following photo you can see the power selector, thje empty breach where the brass rod is and the magazine locking lever just forward of that. Note, to turn the power knob, you need to push the release button on the other side to push the knob out away from a set screw that prevents it from accidentally turning.
I find the safety really easy to use. You simply slide the blade forward with your trigger finger and you are ready to go. I appreciate things you can do by feel without having to fumble around and look. The Gladius has the Hatsan Quattro trigger and you can adjust it. I’m just using it as is right now. There is a long pull but you can feel the resistance increase before the trigger breaks with not too bad of a pull. I’ll play with it at some point.
Here you can see the adjustable buttpad and spare mags in their carriers. You undo the screw with the supplied screw driver and pull it out however far you want. I just needed to pull it out a bit.
I ran two cleaning patches down the bore to remove crud. The first one had dirt and oil on it. The second was much better.
I then loaded up a magazine with 10 JSB Exact Jumbo Diablo 18.13gr pellets and loaded the magazine into the rifle. You load from the back (the first photo) and seat the pellets all the way. I then flipped it over so you can see the front in the second photo.
This is the back side of the magazine. Note it is not smooth.This is the front of the magazine that faces the barrel. Note how the face of the magazine is completely smooth.
I got excited and shot 20-30 pellets before I realized I didn’t take any photos. On power level 6 it was loud. I’d heard to try 3 and 4. I started with 4 and got it down to about 1/2″ groups. I would shoot 4-5 pellets and then pump up the rifle and then do it again. The below is on power setting three which is fairly quiet (not great but good enough) and it had enough power to take out a rabbit and two tree squirrels at 30-45 feet. The following photo is at the end of sighting the rifle in. I’d stuck new Splatterburst stickers on my target and was three bullseyes with three shots. That was good enough for me. In a future post, I’ll do more groups and post them.
So, this is my first take. I like the rifle. It’s heavy but that works for me because the weight of the rifle absorbs my tremor. Accuracy sure seems solid. Next up on my to-do list is to install Huma regulators on both of my air cylinders and to get an additional moderator to quiet it down a bit more. I’ll get to the trigger some time but it is good enough for now.
Short answer – I like it. If I had it to do over, I would have waited on the spare cylinder and the regulators and bought an additional LDC instead to quiet it down a bit more. No big regrets for sure – I’m just very impressed with what this is doing out of the box is all. The pump is also way easier than I expected too – kudos to Hatsan for a fine rifle and Hill on a very fine air pump.
January 27, 2018 Update: I am very happy with this rifle. It hits harder than any air rifle I have ever owned. The accuracy is great and I have no problem taking care of pests. The Hawke scope is holding zero also. Note, the picatinny rings have worked great. What I have come to realize is that Hatsan made a hybrid rail such that the little airgun dovetail rings will work or Picatinny rings. The rifle really likes JSB Jumbo Exact 18.3 grain pellets, a power setting of four and the pressure between 160-190 BAR if unregulated.
March 11, 2020 Update: Still going strong. No problems.
If you find this post useful, please share the link on Facebook, with your friends, etc. Your support is much appreciated and if you have any feedback, please email me at in**@ro*********.com. Please note that for links to other websites, I may be paid via an affiliate program such as Avantlink, Impact, Amazon and eBay.
Well folks, I am taking the plunge into pre-charged pneumatic (PCP) air rifles. These are the airguns you see (both pistols and rifles) than have a high pressure air tank to propel the pellet. Now, I had to think long and hard about this. I live in a rural area and there aren’t any SCUBA/dive shops in my backyard to fill an intermediary air tank to then fill the rifle. I looked into high pressure air compressors (we’re talking 3-4,000 PSI here so this isn’t your average shop compressor) and the starting cost for the cheapest is about $1,100 and in the cost of the tank and the fittings and I was dead in the water.
Recently, I did more digging about hand air pumps. I had heard and read a few things about what a pain they are to work with and it turns out that is either flat out wrong or you bought a bad one. Now everyone is different. I’m 5′ 8″ and about 22o pounds plus not in that great of shape if I am to be completely hones so I paid close attention to what folks said and how they described their physical condition. Bottom line is that there are a ton of people out there using hand pumps.
So, I switched gears and started reading more about the various brands, the reviews they got, etc. Â From what I gathered, it came down to two pumps at the front of the pack – the Air Venturi G6 or the Hill Mk4. Â I then went around the forums, Amazon, Pyramyd Air and Air Depot reading comments, etc. Â Frankly, the Hill Mk4 gets better reviews plus it has an air dryer. Â Given how compressed air systems constantly produce water via condensation, I was sold. Â I ordered my Mk4 from Air Depot. Â For years, I have ordered from Pyramyd Air but Air Depot has great reviews and they had a great deal going for 10% off and free shipping when I ordered it.
Air Depot’s shipped the pump the same day via FedEx Ground and it arrived three days later. It was partially disassembled and I’d say it took about 10 minutes to put it together. I actually followed the directions and be sure to use wrenches on all fittings due to the air pressure. It comes with a small tube of silicone grease and I went ahead and lubed the shaft just to make sure it was ready – they recommend monitoring that.
At the same time I bought the Hill, I bought a Hatsan Gladius Long bullpup in .22. I’ll write about the Gladius more later but it came with the fill probe to screw onto the Hill’s male threaded end fitting. I used wrenches to tighten things down really well, put the Gladius’ air cyliner in a cardboard box to cradle it so I could then pump air in. The hose on the Hill is really short and I suspect it is because you need to pump and pressurize that hose also before the check valve in the Gladius’ air cylinder will open and let air in.
It does take effort as you reach 200 bar (that’s 2900 PSI). The trick is to go slow and use your body weight to drive the handle down – not your arm muscles. I’d bend my knees with my arms locked and down I went. Don’t use your arms – let your weight do the work and speaking for myself, I have plenty of fat … I mean weight 🙂
Yes, it would take a real long time to fill the rifle if I let the cylinder go down to zero but the trick is to shoot a few rounds and keep the rifle in its ideal operating pressure range and refill when you get low — or shoot a few and top if off again. For example, with my Gladius, after six shots on power setting three, it then takes 30 pumps to take it back up to 200 bar – it’s not that hard – really. Why six shots? Well, the pressure was still in the green just now but towards the bottom so I topped it off and counted just to write this post.
To remove the pump from the cylinder, you unscrew a bleed valve knob on the back of the pump to relieve the pressure in the line. Do NOT try to remove the probe before the pressure is released.
The only con I have is that I wish that fill hose was a bit longer but I bet another guy would then say he wished it was shorter. The reason I’d like it longer is so I could lean my rifle against some thing and pump. I can’t do that today because the hose is too short. I’ll probably build a cradle for the rifle at some point vs. unscrewing the cylinder (and it was designed for that which is really cool by the way) and filling it.
I have a Huma regulator on order for the Gladius and will try it and write more about both the rifle and the regulator down the road. The purpose of this post is to recommend the Hill Mk4 pump and to clearly tell you that a hand pump absolutely can get you started in the world of PCP airguns. In fact, I’m kind of embarrassed that I held off due to hearsay until now and want to clear up the misinformation – a pump can definitely get you started. In fact, I do plan on getting a compressor some day but I am in no rush now.
January 25, 2018 Update: The pump is still going strong. I have topped off my Gladius at least 30-40 times – I try to keep the pressure between 160-190 bar – every time the 10 round mag is empty or running low, I top the gun off and add pellets. I just did a bit of preventive maintenance and applied silicone grease to the shaft of the pump and the fill probe. I am still very happy and recommend this pump.
September 24, 2018 Update: Still no problems. I can’t begin to guess how many times I have topped off my Gladius now. I did grease the shaft again just to be safe. I also keep a very light film on the fill probe and keep the probe wrapped in a plastic bag when not in use to keep dirt off it. I shoot two magazines (20 rounds) and then top off. It’s as simple as that.
February 10, 2020 Update: Had one of the O-rings on the fill tube fail and had to replace it a few months ago. Am keeping the probe and pump shaft lubricated with silicone grease.
6/29/2020 Update: Still very happy with the Hill. We now have replacement fill-probe O-rings and caps to keep your fill probe clean. Click here to learn more.
If you find this post useful, please share the link on Facebook, with your friends, etc. Your support is much appreciated and if you have any feedback, please email me at in**@ro*********.com. Please note that for links to other websites, I may be paid via an affiliate program such as Avantlink, Impact, Amazon and eBay.
