Officially licensed replica of the B&T GHM9-G "grasshopper mouse" PCC Fully engraved markings to match the real thing 300 to 340 fps (0.84 - 1.07 joules) Polymer upper with lightweight nylon-reinforced polymer lower & handguard Designed to be highly modular, allowing you to swap the lower, handguard, barrel, tail cap & more! Full length 20mm RIS on upper receiver for mounting optics, lights, lasers & other accessories Railed tail cap allows you to mount standard 1913 Picatinny stocks or sling mounts Compact handguard w/ M-LOK slots on either side & 20mm RIS on the top and bottom Adjustable Hop up AR-pattern grip allows you to customize based on your preferences and comfort Includes a 30rds Green gas magazine (Glock spec) Compatible with GLOCK 17 (VFC GBB system by Elite Force & Spartan, Tokyo Marui, Action Army AAP-01, SAI BLU, ISSC M22, Lonewolf, ZEV, G&P Custom, P80 and other GBB Magazines w/ WE-Tech Gas Blowback System. NOT compatible with GLOCK with KWC / WG GBB system) Inner Barrel: 97mm