This is a very high quality build with no expense spared. Roughly a 900 dollar build and has zero issues. This is a great deal for a serious collector or hi capa fan. BUILD LIST......Airsoft masterpiece= am airsoft masterpiece infinity sv frame Am aluminum infinity slide Am steel internals Am hammer and strut Am leaf spring Am infinity skater grip Uac black outer barrel Uac rear sight Am blowback unit Am loading nozzle Uac rocket valve Am nozzle return spring Am brass hopup unit Am Steel hop up arm Am hopup wheel Prommy purple bucking Pdi 6.01mm stainless steel inner Barrel Short stroke kit All springs upgraded and tuned Comes with two Tokyo Marui stainless mags