Unicorn Airsoft 300mm Nitroflon Coating 6.03mm Ultimate Precision Barrel For GBB

300mm UNICORN Nitroflon Coating 6.03MM Ultimate Precision Inner Barrel For GBB
Fits for 11"~11.5" (Approx.) BBL GBB Carbine style.
1. Material: Brass with Nitroflon Coating
2. GBB specification, included GBB 60 degree bucking, 50 degree Hop-Up Nub and brass ring

For VFC Colt M733 GBB. (Slightly longer than outer barrel)
For VFC Colt XM177E2 GBB. (Slightly longer than outer barrel)
For GHK M4 GBB 12" (Need new GHK HOP-UP set for GBB SPEC.)
For WE M4 12" GBB Setup.
For MARUI M4A1 MWS GBB 12" Setup.
For 11.5~12" (Approx.) BBL GBB pistol.
Still compatible with other AIRSOFT model which with GBB HOP-UP SPEC.