Feature：

➤ For GBB/VSR10 spec inner barrel and without modify.
➤ Addition of a slimmed down black air-seal ring for better efficiency.
➤ The "Shield" shape groove design has better hop effect when tensioner/lever press it.
➤ Larger & wider contact area inside of BB pellet, has better hop effect with heavy BB.
➤ 60 degree.

➤ For GBB/VSR10 spec inner barrel and without modify.
➤ Addition of a slimmed down black air-seal ring for better efficiency.
➤ The "Shield" shape groove design has better hop effect when tensioner/lever press it.
➤ Larger & wider contact area inside of BB pellet, has better hop effect with heavy BB.
➤ 70 degree.

➤ For GBB/VSR10 spec inner barrel and without modify.
➤ Addition of a slimmed down black air-seal ring for better efficiency.
➤ The "Shield" shape groove design has better hop effect when tensioner/lever press it.
➤ Larger & wider contact area inside of BB pellet, has better hop effect with heavy BB.
➤ 80 degree.