1911, Gunsmithing

Tuning the 10mm Springfield Armory TRP Operator To Feed Reliably

After the very disappointing performance of my new 6″ 10mm TRP Operator at the range, I knew I had two options. First, I could send the pistol back to Springfield Armory for repair or two, I could try just a bit of light polishing first. I had good reason to want to try the second option first.

A few years back, I had a Rock Island Armory 52000, that’s their big top of the line doube-stack 10mm, that had problems feeding Underwood ammo but not S&B or SIG. In looking closely at what was going on, I could tell the lip of the case was hanging on the lip of the barrel and not going in. I used a rubber abrasive Dremel bit, rounded the edge of the chamber ever so slightly and the problem was solved.

In looking at the brass coming out of the TRP during test firing, it was getting very scratched and in some cases actually nicked/gouged as it went up the feed ramp and pivoted to then be pushed into the chamber. The rounds that stopped dead and would not feed had to be tapped out with a cleaning rod. They all had a slight nick/gouge in the case where the edge of the barrel literally bit into the brass effectively locking the round in question in place.

I sure wasn’t happy at the range but at least I had a plan of attack. When I had time a few days later, I waded in to try fix the problem.

Before you ever work on a firearm, make sure it is not loaded. Be sure to check the chamber and do not have a loaded magazine in it either.

Disassembly

The 6″ TRP is a slightly odd beast. It does not have a traditional guide rod. You disassemble it just like any other 1911 by pushing the slide forward to the point the slide stop aligns with the disassembly notch and pushing the slide stop out. I don’t know of any tricks to unload the unique recoil spring system the 6″ Longslide TRP has.

As you move the slide forward off the receiver, be prepared for the spring to want to jump out so be sure to have a hold of it before you get the slide half way off exposing it forward of the browning link.

Notice the heavy bull barrel with no bushing and also the unique recoil spring. There is that stubby little guide rod and a long plug that the spring goes into. As far as I know, this is unique to the 6″ Longslide model and is not found in the 5″ TRP.

The spring system is annoying during disassembly and re-assembly but I am getting used to it. I checked with Wilson and Dawson plus did some googling around and nobody has anything to replace it so I’ll just deal with it.

The Barrel

Okay, I took the barrel and looked at the point where the steel transitions from the feed ramp to the chamber. It wasn’t polished and it was practically a knife edge. No wonder the rounds where getting torn up or even caught on that sharp edge.

This is the barrel straight out of the TRP without any cleaning or work done. The ramp is fairly smooth but I wanted to polish it more – same for the chamber but boy is the top of the feed ramp an abrupt sharp angle. No wonder cases were scraping on it and/or getting hung up.
If you look at the angles of the three types of rounds I was test firing with, the most successful was the 220gr hard cast in the middle. The S&B 180gr FMJ on the left has more of angle and the XTP on right has an even greater angle. None of the bullets were damaged during testing it was the cases. Notice that the greater the angle the worse the round fed and the more chewed up the case was.

To address this, I got out my Dremel, rubber abbrasive bits, some felt bobs and also a bit of 800 grit polishing compound.

One thing to remember up front – you do not need to take off a ton of material so use a fine grit abrasive and a relatively low speed. You want to work a bit and test until you get it right where you want it.

That’s a close up of the TEMO rubber polishing burr that I use to round over transition from the ramp to the chamber. Basically you want to get rid of that abrupt sharp edge and round it so that it is easier for a cartridge to tip over and get pushed into the chamber.
You can see the rubber that came off the bit during polishing and also note the slight rounding at the top of the feed ramp – that is exactly what we want.
Next up is to polish the ramp and the chamber. To do this I used a 10mm felt bob and 800 grit grease-based lapping compound. I’ve used Flitz in the past too by the way and it works. I like the Goodson compound due to it being petroleum based. It seems to cut better and doesn’t fly all over the place. Note, this is 800 grit and we just want to polish – our goal is to remove as little material as possible while getting the job done.
Okay, here’s an action photo. I polished the chamber and the ramp already. You move the bob around and don’t sit in one place – back & forth, up & down, in & out. Think of it this way – you are your own random orbit sander and don’t want to stay in any one place too long and remove any more than needed.
I put CLP on a 10mm Ramrodz (think of a Q-tip made for cleaning a 10mm pistol barrel) and cleaned it it out followed by a second to mop any remaining debris. I carefully cleaned the other surfaces as well.

Greased the parts that slide

When we were at the range, I noticed the action was sluggish at times. This is to be expected during the break-in/wear-in period of any firearm. What I do to help the parts get to know each other is to use an acid brush to apply a light film of SuperLube grease to the parts that slide. Not a ton – just a film. For the TRP, I put it on the slide rails, the bottom of the slide. the exterior of the bull barrel and in the slide where the barrel passes. Wow – what a difference. The slide feels smooth as glass now. I also again put a drop of SuperLube oil on the trigger, hammer, browning link, etc.

Re-assembly

Putting it back together takes some practice – re-install the barrel and try to hold the recoil assembly in place as you slide on the receiver. For me, it’s easier if I do it with the slide inverted (bottom up), hold the slide and spring with the left hand while guiding the receiver into place with my right. One the receiver is on about half-way, the spring is adequately captured. Now, this also means that when you go to re-install the slide lock, you are fighting the tension of the spring. I support the pistol on a table during this step and am getting better at it. If someone has found a magic trick, please email me 🙂

Test Feeding

The proof is in the pudding right? I had to test in my shop vs. the range so that meant I needed to be very careful about where the pistol was pointed. Do what you are comfortable with and be safe.

I loaded up three magazines with three rounds of each to start. All hand cycled just fine. Prior to the above tuning, I could not do that. I then loaded up full mags of each and repeated the tests – everything hand cycled just fine.

Conclusion

I hope to get to the range at some point this week to verify the results. I fully expect it is good to go now. Also, let me again use this opportunity to point out this is why you always need to test your combinations of pistols, magazines and ammo. The TRP Operator is an excellent pistol but I knew not to rely on it out of the box. There are just way too many variables to take that gamble.

2/16/2021 Update: Read this post where I list the Q&A between readers and myself about the TRP.

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Sources For the 10mm TRP Operator and Ammo

Here are some reputable vendors you can order either the 5″ or 6″ TRP Operator plus ammo: