It’s has been upgraded with a lot of steel parts; both internally and externally. The gun has been taken care of very well and performs amazingly. There are no issues whatsoever and it was in fact serviced by a nice tech I met on this sub about 1 and 1/2 months ago. Also, this gun with the angry gun buffer and the hpa aylan mag (both for sell) kicks very very hard. Internals: - AST polished steel bolt carrier - AST hop up - Maple leaf 60 degree decepticon bucking - Angle custom barrel (lapped and polished) - Angle custom nozzle (with extra cqb nozzle spring) - Head quarters 150% nozzle return spring - AST steel trigger box - Angry gun recoil spring w/ guarder lightweight buffer. - AST steel bolt stop Externals: - Daniel Defense ris ll 12.5 inch - AST outer barrel 14.5 inch - Steel bird cage flash hider - AST body pins - AST forward Assist - AST ambidextrous selector switch - MFT rear iron sight - KAC front iron sight - AST dust cover - Element AGR pistol grip (best grip ever) There is not a single issue with the gun, more pictures and a shooting video upon request. I’m asking $450 obo for the WE M4 with g&p stubby grip, mro replica, and one mag. Extra mags are $25 each and I have an Aylan Airsoft drum mag I can include for $100 Please pm me with any questions.