This gun is restricted for sale to Law Enforcement, First Responders and Military ONLY and you will be required to complete a form and send us a copy of your credentials prior to shipment to your dealer or picking up in our store. Please note that it is illegal to misrepresent yourself as a qualified individual to purchase this gun, and we may charge a $25.00 penalty for each occurrence as this is clearly stated that this is for qualified individuals only. Please click HERE for details.The G21 Gen5 MOS delivers improved accuracy, light recoil the option to install an optic. Gen5 features flared mag-well has a larger funnel; Glock Marksman Barrel (GMB) more aggressive polygonal rifling with a target-style crown and tighter chamber specs; ambidextrous slide stop levers offer increased ergonomics for left-hand shooters and shooting with the support hand; removal of finger grooves; Safe Action System, safeties disengage sequentially as the trigger is pulled and automatically re-engage when the trigger is released; enlarged floor plate makes it easier to pull the magazine free of the pistol and customizable frame size with backstraps in two sizes with beavertail. The multiple backstrap frame allows the users to change the circumference of the grip to fit their individual hand size. MOS features a slide that is precision machined to provide a mounting system for popular optic sights. With multiple adapter plates (sold separately), you can quickly and easily mount miniature red dot sights. Includes one adapter plate, three magazines, mag loader, cleaning kit, pistol case and gun lock