AK Sponsor
Posted: 6/30/2005 7:06:33 AM EDT
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I have an old 80% prebent receiver from ACE ARMS in my junk pile and decided to start messing with it. Both my rear and front trunnions fit into place. I just downloaded the ACE ARMS template for prebent 80% receivers and had a few questions about the drill bit sizes indicated. It lists sizes like .1950 and .2720 for the axis pins. It also lists .2220, .3940, and .1950 for the selector lever. I haven't been able to find bits that match this conversion to inches. I assume that that AK receivers use metric holes. I thought that the axis pins were 7mm and 5mm. .1950 works out to 4.95mm and .2720 works out to 6.91mm. I bought a 7mm and a 5mm drill bit. What have you guys been using? I printed off a copy of the template and lined it up with a TAPCO flat that I have in the junk pile. The holes are similar but some are way off when lined up against the selector lever holes. The trigger hole is about 1mm off and the hammer hole is about 2mm off. People have been using TAPCO flats successfully for a long time so I know they work well. I also know that AKM's are not rocket science and the tolerances are wide. I just don't want to screw up my blank by using a messed up template. I held a receiver and a TAPCO flat up to the light with a template and saw that the template is off when it is oriented to the selector hole of the receiver. So the other holes are off in relation to the selector holes. Hope that makes sense. |
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I have a 5mm and 7mm bits I use to "ream" the trigger and hammer holes after heat treating flats I bent. Even used them on Global/Armory receivers to insure the pins would fit fine. If you have an AK already, you might try measuring between the axis holes and split the difference between the Tapco measurementn and your template measurements. If you have to fudge a little, I would certainly go closer to the measurements on a factory AK like a SAR1. |
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