Description Double Bell Spring Parts Set for Glock 17 GBB Gel Blaster (G17-TH) Double Bell Glock Spring Parts Set for GBB G Series Gel Blaster Pistols. This is an amazing replacement or upgrade parts kit for your double bell G Series GBB pistols. MATERIAL: Metal COMPATIBILITY: DOUBLE BELL G17 , G22 , G34 Series Gas Pistol Gel blasters
