Just finished the top rail step down gage. The last home made stamping I'll EVER do for an AK. (got em all done now).
I tried for weeks to get a few machine shops to make me a 6" long one, just like the soviets used. Since nobody had time for me, w/o a ton of cash.. I decided to make it myself in the basement using files, bench and die grinders, drill press, and a lot of testing and fit up. Wasted a cold steel receiver in the process! oops..
Thanks goes to Hopster for giving me the bolt idea in the first place.
Works great, step is not as perfect as an original or any of the commerical receivers out there, but its home made and i don't need a press. I simply do 1" of the step down at a time and slide the tool down, do 1" more, etc.. until the step is complete. They look remarkably good and straight considering its not one long tool.
Hard part, getting enough torque on the bolt and then holding the receiver while tightening w/o bending it. i need a nice long set of wrenches.
Post pics of all the home made stampings on the reciever this weekend. Hope this inspires some home builders to make thier own.
Its 1060 steel block. Most of the other ones i do are strain hardened 304 bolts.
Step is 0.030" (0.75mm) - slightly more than the 0.020" required to make the top rail equivalent to 1.6mm. I measured 0.025" on the romy original step, Curtis from Ak-builder recommended 0.030". Step radius ends about 3mm from the outside receiver edge.
You can see the receiver step on the right had side of second pic .
Edit: here is the original idea, to put the step downs in all at once. I also just figured out a way to improve the step down even more, flip my gage over and go back over the already stepped part - makes it nice and even. pics coming.