Description MOS (Modular Optics System) platform offers a convenient way to mount reflex sights without costly alterations to a warrantied slide. Includes an Adapter Plate Kit containing 4 adapter plates as well as the tools for the removal and installation for a variety of optics. Optics are not included with the MOS pistols. Adjustable sights. Multiple back strap design. Gen4 Rough Textured frame. Dual recoil assembly. Reversible magazine catch. GLOCKÂ accessory rail.Specifications:Barrel Length: 5.3Barrel Length Range: 5 to 5.9Caliber-Gauge: 9MMCapacity: 10Finish: BlackHand Gun Web Model: GLOCKÂ 34Made in the USASpecific Caliber: 9mmTactical Firearms, trailers, and some accessories are only available for purchase in stores. Each location follows all BATF and individual state/county/city laws to insure the desired product is legal for sale. Any info provided online is subject to change, please go to your local store for more accurate information.