Home » Shop » Universal Advanced Hop-up Chamber & Inner Barrel O-Ring “TOP NEW M4A1 CARBINE (Shell Ejecting + Electric Blowback AEG)” has been added to your basket. View basket Universal Advanced Hop-up Chamber & Inner Barrel O-Ring$9.99 Universal Advanced Hop-up Chamber & Inner Barrel O-Ring quantity Buy now Add to WishlistRemove from Wishlist Add to Wishlist SKU: ibR-M4-BLU Category: Uncategorized Product ID: 48611 Additional information Additional information Weight 40 g Related products Add to WishlistRemove from Wishlist Add to Wishlist G36 Stock Adaptor w/ M4 6-Position Pipe for Marui, Classic Army, JG AEG $31.20 Buy now Add to WishlistRemove from Wishlist Add to Wishlist Firefox Li-Po Battery Alarm Tester with 6 LED (F3S001) $8.00 Buy now Add to WishlistRemove from Wishlist Add to Wishlist Action AUC A3 Electric AEF – FESP $249.00 Buy now