In the second installment we will be working on a step equally important as the first. Now put to the test are our mapping skills of our drilling location. As it is our intention here at Ghost Guns to not let anyone be dissuaded by lack of tools they have, I might make suggestions here but nothing I suggest will rule out the possibility of an equal or better finished product. However the suggestions will offer a higher success rate and increased ease at which the task can be completed.
I refrain from using the vice here to exemplify to those of you who will be using a hand drill. In the diagram provided with our View larger
AK47 Builder Tooling and Fixture Bundle you will see the drill bit sizes and the corresponding holes they pair with. moving to the side of our blank displaying an X and Y, these are the axis pins locations where the fire control group is housed. the X will be our trigger axis and the Y our hammer axis. You’ll see a smaller “y” directly in front of the X we will not be using this axis this is for military configured firearms. the side with the X and the Y will be a 7 mm and on the corresponding, (opposite side) holes are 5 mm, very important, these are correct and precise and if the centers don’t line up perfectly they will not install correctly, we will bind the components later on during final installation.
All of our trunnion holes as well as our center support, traditionally in millimeter but with only several thousands degree variance, we will substitute for 5/32, the size of our rivets. It’s possible to run the drill bit all the way through corresponding location when the option exists.
I can’t emphasize enough the importance of precision of the location here, the slightest difference in table elevation for example that throws the level of the receiver off. If you have a drill press in a vice it’s one thing to get everything lined up clamp securely in place and triple check all surfaces for levelness. Having your trunnion in the receiver so that you can use the trunnion hole as your guide is smart but make sure that it goes through the other side, if the drillbit is not going straight through the opposite trunnion hole , something is either off, and it could be the trunnion itself has misaligned holes. At this point just flip over the blank going side to side. Unot attempting to run the drillbit all the way through the receiver on the front trunnion.
Use your locator tool as shown to find the front trunnion holes and you’ll use your templates to mark your rear trunnion holes, which are long rivets and will go all the way through. On the rear trunnion these holes must be drilled with the rear trunnion on the receiver blank, if the drillbit goes through one you’ll know right away, if you’re off, use your rear trunnion as a secondary means of checking the accuracy of the location marked from the template with your transfer punch. With very careful visual inspection and everything secured begin drilling, it should go smoothly all the way through. The trunnion should stay in place, it shouldn’t move right or left as the drill bits are passing through. on our safety selector holes we have a large hole and a small hole right next to each other, the centers need to align horizontally parallel with receiver. sometimes if the drill bits are Dull A pilot hole may be utilized on the larger of the two, if the drill bits are not drilling smoothly or cleanly the likelihood of an accident or a misaligned hole location greatly increases, we want to use new sharp drill bits. After you drill one of these two holes pull your drill away visually inspect it to make sure that the centers are going to align, if you’re off a little bit in the centers of the small and the larger hole do not align the keyway for the safety selector will not adhere to it’s design properly and this will affect function and create difficulty when installing the fire control group. We have 7/32 on the opposite side where the single hole is and we have the 7/32 along with the 10 mm for a larger hole on the safety selector side, take your time don’t be in a rush if you feel frustrated at any time stop & set it down, walk away come back again. While the Kalashnikov may be a platform that says hard and fast this certainly does not apply during its construction and in fact will quickly turn a good experience into a negative one. First two steps here may be the most critical of the entire operation. Once you get through these first two steps and maybe one or two more that are quite as bad you’re on the fast track to becoming an AK builder