Flats usually have holes stamped in them at fore and aft so they center themselves on the fixture. That's only if the fixture has pins to engage those holes. So I marked and drilled holes and fitted pins that align with the holes. The bottom plate of the fixture needed some relieving so it would fit over the pins. Now I just set the flat on the center piece of the fixture and press it upon the pins.
Flats have dimples struck into them to align the magazine, to put tension on the selector lever, and to align the hammer and trigger axis pins. My fixture is relieved for the mag well dimples but none of the others. I made shallow drills at the right spots, then hogged them out somewhat with good buddy rotary tool, so the fixture won't damage the dimples. Below, the selector lever dimple on the op side.
Then I figured out that I could pre-bend the sidewalls of the receiver box by using the side plates of the fixture in a sheet brake. Yup, got one of those from Harbor Freight some months ago, so I clamped it all together and got the sidewall bends started. Below, the op side fold.
Since I was this far along, I figured I'd go ahead and bend the flat the rest of the way. This is a flat from AK-builder, and it's far superior to the Tapcos. I'm seeing great things in this K'lash, which is a Polish underfolder from the good people of Gunthings.
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