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11/20/2019 5:07:11 PM
Posted: 10/13/2013 8:41:25 PM EST
There are two fixed stock AKM flats available from AK-Builder. One has the trunnion holes pre-punched, the other has no trunnion holes drilled.

With holes:


Without holes:


Obviously the flat with holes already drilled is the easier of the two options, but there's a warning that they may not line up "due to how the factories drilled the holes in the trunnions".

I will be using this flat for a Russian AKM build. Should I cross my fingers and hope the pre drilled flat works, or should I get the other flat? I've seen a tool used to locate the trunnion holes that looks like a modified pair of tweezers. Where can I get this, and is it effective?

Link Posted: 10/13/2013 9:29:54 PM EST
I've never had an AK builder flat with trunnion holes that was off so far that the rivet head didn't cover the difference.

The pre-drilled flat saves time, but measuring and drilling your own holes isn't hard either. Just use a caliper and center punch, making sure to double check before punching and drilling.
Link Posted: 10/14/2013 8:33:21 AM EST
+1 on the predrilled.

I have done it both ways now, and even if the predrilled flat is off its seems more accurate that my different attempts to measure, mark drill by various different processes.
Link Posted: 10/15/2013 2:58:15 PM EST
If you have access a drill press you can get the flat without holes & drill them yourself with this.
You mount the trunnion on this fixture & center the trunnion rivet hole with drill bit, then slip the bent flat over the trunnion and drill the hole. Then repeat the procedure for each hole, this will give you a receiver with holes just for your trunnions.
Or you can take you chances that the Russian that drilled your trunnions didn't have too much vodka that day.
Link Posted: 10/24/2013 2:52:08 PM EST
[Last Edit: 10/24/2013 2:55:38 PM EST by toxik]
I've bought NDS receivers and Ewbanks, both of which I've needed to do some rivet hole tweaking. I've since moved to Ak-Builders no trunnion hole flats. I use a transfer punch with the intended trunnion, prior to bending. I find it's more accurate than a pre made receiver, due to de-milling practices not always being perfect. This way, I can be assured trunnion will align perfectly with the holes. You can't go wrong with Ak Builder parts....

Transfer punches are in the $20 range at Harbor Freight. Can't beat that..
Link Posted: 10/28/2013 11:50:24 PM EST
This jig was pretty easy to whip up.

This method for the rear was even simpler.

Then I use one of these. Harbor freight sells one that works great for about 18 bucks.
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