Inception Designs Genesis Barrel Back for PWR insert Color:Polished Black Airsoft Innovations devised the ability This PEQ Lipo battery Airsoft Innovations devised the ability to carry the gas safely on the field in a smaller form Accurately take down your targets and win the match with the Tactical SD94 Spring Airsoft Sniper Rifle This allows the use of a single outer barrel back that can be more cost effectively matched to the gun and it's anodizing yet maintains all Stella barrel performance features AND is available in many sizes The muzzle end has a chamfer to promote the best alignment with the barrel front possible