I've been looking through the subgun BIY and it got me wondering if anyone else has ever built thier own subgun (semi) from scratch or mix and match parts. I have a running idea and sketches for a sub caliber carbine that uses AR15, sten, sterling,grease gun, and other subgun designs to produce a sub-caliber plinker. Has anyone else ever tried to make a bolt and receiver set from scratch and adapt parts to work?
My idea uses an AR15 FCG, upper tube receiver, lower square channel receiver, and some custom made parts. The barrel is retained like the AR barrel with a large threaded nut and an indexing pin in the barrel (although if its just a plinker and sights are mounted on the receiver it may not matter about indexing the barrel). Its also possible to build a pistol using another smg barrel if that route proves to be easier, or use a simple wire folding or non-folding stock made from bent 1/2" round bar and put the receiver on an F1.