Airsoft Surgeon Air Seal hop up chamber for Tokyo Marui GBB and VSR-10

The inner diameter of the Airsoft Surgeon hop up bucking is smaller and tighter than any existing hop-up rubber, so it will be more air-tight increasing the fps.Ideal for 280 to 400fps GBB / Sniper Rifle, to get the best performance. Airsoft Surgeon recommends using the best quality hop up chambers and BBs.