COWCOW ALUMINUM BLOW BACK UNIT FOR MARUI G19, G17 GEN.4 GBB (BLACK) AEP Airsoft Guns Can use all standard M4

Can use all standard M4 style midcap and hicap magazines

Just your standard 'ole black metal M4 airsoft magazine

The angled surface is minimized to the point that it is functional

Umarex 2274303

COWCOW ALUMINUM BLOW BACK UNIT FOR MARUI G19, G17 GEN.4 GBB (BLACK) AEP Airsoft Guns Can use all standard M4G19 Blow Back UnitHighlighted features6061 Aluminum material with CNC machinedUltra lightweight designDurable construction prevents flexing and warping under hard useProvide stable and smooth blowback cyclingPerfect Fit with COWCOW piston headAvailable in Black and SilverFor TM G19, TM G17 Gen4 and TM G19 Gen4*PS: Please note: installing parts assemble fitting airsoft gun will need intermediate knowledge; for expert or airsoft gunsmith. Please refer