Actually quite a frankengun lol! Butt stock, metal receiver and trigger mech from a 5th variant 760. Barrel is a 15'' left over piece of a 24'' Crosman 2260 .22 barrel I bought a while ago, machined to fit a plastic barrel support/breech. Compression tube from a M4-177. The piston and valve are bone stock 760 stuff. I cut off the stock probe off the cocking block and made a new Oringed, open bottom, flow-through bolt probe, and machined the pellet channel in the receiver to 1/4''. I get a max of 491 fps with 11.9 GR Hobbys, and 463 fps with CPUM 14.3 grains. I use a UTG 3-12x32 AO SF scope on the gun, perfectly balanced for its size. I also added a small steel muzzle brake to complement the package, and a 13xx forearm to slim the rifle's line down a bit. The gun is very nimble, only 32'' long. Hope you like the view!
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. I've used and seen used the term many times for custom builds, have a few frankenguns myself 