G&P 39 Rds Magpul GBB Magazine for WA / G&P M4 System (Sand)

G&P 39 Rds Magpul GBB Magazine for WA / G&P M4 System (Sand) Metal Construction Suitable For WA/ G&P M4 System Sereis Airsoft Gas Blow Back GBB Rifle Also fits Inokatsu gas blowback GBB M4 Rifle P-Mag Style With Removable plate on the bottom The knocker has a roller bearing on it for smoother sailing on your GBB rifles bolt For 6mm Plastic Bullet only Best accompanied with Plastic Bullet Loading Too or Speed Loader