【カスタム】M870ガスショットガンの内部カスタム 初速アップ

To increase the muzzle velocity of the M870 (Breacher), we installed a custom release valve shaft and a 150% hammer spring. As a result, the muzzle velocity increased from 75-78 m/s to 81-82 m/s (measured at 0.2g). Product links below: MAGPUL SGA Stock MAG460 for Remington M870 https://repmart.jp/products/mag460blk... WII TECH Hammer Spring for Tokyo Marui M870 Gas Shotgun, 150% https://amzn.asia/d/3jGAlGA WII TECH Ejection Valve Shaft for Marui M870 (Stainless Steel) https://amzn.asia/d/gIHH6ka Gun & Hobby Wooper Inner Barrel Fixing Reinforcement Ring for 3-Shot Shotguns https://amzn.asia/d/2l5uzzp Gun & Hobby Wooper SK-2 Building, 2-14-24 Shin-Yokohama, Kohoku-ku, Yokohama, Kanagawa 222-0033 4F-B The super-kind manager at Wooper https://x.com/gunshop_wooper?s=21&t=M...