From an AK-47 Lower Receiver Blank
By: Silver Dollar a.k.a. 7.62x39
Please note that this method of building is one builder's technique
(and a very efficient one at that). Techniques vary from person to
person (and blanks). There's hundreds of different methods you can use
and if you find one that's comfortable for yourself, then use it! If
Silver Dollar's methods work for you, by all means follow this tutorial
step by step. If you have any questions at all, feel free to contact us.
The Front Trunion
Since these blanks are a brand new item, I thought I would document the
steps necessary to complete a build using one of them.
I start with the front trunnion and work my way back.
Edit: Since this tutorial was done, I've learned that you are better
off mounting the TG first, then use a mag to verify front trunnion
Step one is to fit the front trunnion.
All the measurements I use should be checked against your own kit as
they may vary.
First, remove approx 1-1/4" from the front of the blank.
Note: This tutorial was created using a longer
blank. Some blanks require NO TRIMMING at the front. Start off by FIRST
fitting the front trunion (trim the top rails for the trunion to go
in). THEN remove metal with a file ONLY to square the front of the
blank off with your trunion/barrel assembly. Final fitting for the
overall length should be done to the rear of the blank.
Editor's Note: This can be done with a
variety of cutting tools, including a dremel and cutoff disc, hacksaw
and/or chop saw. Always remember to square off the top of the blank for
Next, remove almost the entire top rail for the first 2-5/8" leaving
just enough of the bend to engage the "slots" in the trunnion.
Always remember make all cuts long and file to fit.
Locate and drill mounting holes for front trunnion. Start undersized to
check the location, finish with a #21 drill bit.
Editor's Note: The above step is easier
done with the trunion separate from the barrel. This step can also be
done with your trunion attached to your barrel, but be sure to measure
a few times to be sure of the hole location. Alternatively, this step
can be done last. If you choose to do the trunion holes last, you may
use c-clamps to hold your front and rear trunions in place.
I use #8 machine screws to temporarily hold every thing together while
building, they fit perfectly. Also notice how the upper bends in the
receiver blank lock into the groove in the trunnion, to orientate it
while the sides lay flush against the trunion.
The front trunnion is finished!
Next Step - Magazine Well