Originally Posted by
TiroFijo
1- as stated, frankengun. I don't kow the origin of all components
2- various brands of 223 and 5.56, 55 and 62 gr
3- the gun cycles weakly, sometimes too short so it picks round from mag but fails to feed properly
4- we were thinking about doing a chamber cast, if that is inconclusive we'll have to ream the chamber to 5.56.
Edited to add: my friend has already opened up the gas port to 2.0 mm (0.079"), he will try several buffers, upgrade extractor springs, etc., we'll see...