UNICORN Nitroflon Coating 6.03MM Inner Barrel for GBB with Bucking

UNICORN Nitroflon Coating 6.03MM Ultimate Precision Inner Barrel For GBB with Hop-Up bucking. outer: 8.55MMBARL inner: 6.03MM material:Brass electroplating nitroflon coating included: UNICORN AEG 60 degree Hop Up Bucking included: UNICORN 50 degree Rubber Hop Up Knob/Nub included: AEG Fixed copper ring