Silverback SRS Flat Hop Up Rubber & Nub Set for SRS Sniper Rifle (50, 60, 70 & 80 degree)

Silverback SRS Flat Hop Up Rubber & Nub Set for SRS Sniper Rifle (50, 60, 70 & 80 degree) Rubber Construction 50, 60, 70 & 80 Degree Design for Replace the Original Hop up rubber Suitable for Silverback SRS Series Airsoft Rifle