Converting a Milled M70 Front End for a Sheet Metal Receiver Using Screws

Ok, let’s take the heresy a step further.  In a previous post I described taking a milled stub and welding it to a sheet metal receiver.  Another approach is to drill, tape and use alloy screws.  So, let’s talk about that a bit.  I did this build back in 2010 also.  I actually still have the rifle and it’s one of my most reliable AKs.  It takes about any ammo I stuff in it and I don’t recall ever having any issues.

For those of you who are wondering why I didn’t do rivets – I was bored and wanted to try something different plus this is a range gun and not something mission critical.  Here we are 7 years later and it’s still doing fine – no cracks, no loose screws … but it isn’t stressed either.  When in doubt, do rivets or a milled gun.

In terms of this build, I milled the trunnion down the same as I did for the weld build.   I used my Hungarian AMD trunnion as an approximate guide for locating the holes and used two #10 screws for the front top and a 1/4″ for the rear.  In both cases, I opted for national fine.  10-32 and 1/4-28.  So, for 10-32, I used a #21 drill bit to make the hole  and for the 1/4-28, I used a #3.

For drill locating and drilling the receiver holes, I used the AK-Builder trunnion rivet locating jig.  You just put the trunnion on the jig, locate the hole, slide the receiver on and drill the hole.

Now for tapping, being square is a good idea.  I squared my table to the drill press’s chuck and used it to hold the tap.  I use Tap Magic cutting fluid to lubricate everything.

For the screws, I used alloy button heads and secured them with red thread locker.  I reached in with a Dremel and ground down protruding screws.

So there’s the front.  I used an air riveter to do the trigger guard.

I’ll post some more on this build in future posts.

So, here are some links for you:

 

[amazonjs asin=”B00A769M1U” locale=”US” title=”Century Drill and Tool 26221 Cobalt High Speed Steel Drill Bit, 21/64-Inch”]

#3 drill – these are expensive on Amazon.  Before you buy any drills or taps from Amazon, check out McMaster, MSC and other industrial sources first.  I used to get a lot from Enco but they were acquired by MSC so I pretty much look at MSC and McMaster for cutting tools plus a few specialty items from other places.

[amazonjs asin=”B003A4JHCU” locale=”US” title=”Irwin Tools 2531- 3 Piece Set – 10 – 32 NF, High Carbon Steel Machine Screw Tap”]

[amazonjs asin=”B003A587Y8″ locale=”US” title=”Irwin Tools 2623- 3 Piece High Carbon Steel – Tap 1/4″ – 28 NF”]

[amazonjs asin=”B003X3ZKXI” locale=”US” title=”Forney 20857 Tap Magic Industrial Pro Cutting Fluid, 4 oz”]

AK-Builder Trunnion Hole Jig


If you find this post useful, please either buy something using one of the links to eBay and Amazon to buy something.   With Amazon, if you click on one of our links and then buy something else – even unrelated stuff like clothes, electronics and groceries – we get credit and it would be hugely appreciated.  Doing something like the above will help us fund continued development of the blog.


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