Cobra Features: Quick installation, attaches instantly! No handgun modification required! Rapid deployment mechanism; extends easily from the folded position into a full length deployed buttstock. Integrated Cheek Rest. High traction rubber Butt-Pad. Can be used with any holster Replaceable adapters, fits both G17 & G19 frames in GEN 2-5. Durable and light weight fiberglass reinforced polymer construction. Compatibility: The Cobra stock will fit all of the following Glock models 17, 19, 19X, 22, 23, 24, 25, 31, 32, 34, 35, 45 / GEN 2 - 5 The Cobra stock G17 GEN4 adapter will also fit the IWI JERICHO Polymer full size models- PL, RPL, PSL Cobra Dimensions: Weight:328 gr Width: 42 mm Height: 140 mm Length: 240 mm Height (open/deployed): 153 mm Length (open/deployed): 332 mm FAB COBRA STOCK ALL NFA RULES APPLY - NFA RULES are the federal laws which regulates the sale and possession of certain weapons including: Machine Guns, Suppressors, Short Barreled Rifles, Short Barreled Shotguns, Destructive Devices and AOW. Addition of the FAB COBRA STOCK set to a Glock type Pistol results in the manufacture of a short-barreled rifle (SBR) which falls within the classification of firearms subject to NFA controls. If you actually possess a pistol and the FAB COBRA STOCK device, even if the pistol is not assembled into the FAB COBRA STOCK device, the combination would constitute a short barrel rifle (SBR) which may not be lawfully possessed unless it is registered per NFA Laws. Check your State and Local Laws for any addition restrictions. Export of this product is controlled by US State Department & ITAR For more information please contact the BATF https://www.atf.gov/contact