"Modeled after the legendary HK51, the Century Arms AP51 Semi-Auto Pistol is a sub-gun platform chambered in the full-power 7.62x51mm NATO cartridge. If that sounds like a handful, it is. That's why the original HK51 earned the nickname ""The Flashbang Dispenser."" It's loud, it's concussive, it's devastatingly powerful, and it's a ton of fun to shoot. Like the original, the AP51 PDW utilizes the roller-delayed blowback action and features a stamped receiver and 8.3"" cold hammer-forged barrel. Other features include an ambidextrous safety selector, MP5-compatible wide handguard, and G3-pattern magazine. The AP51 PDW has been tested to NATO environmental standards for salt, fog, humidity, hot/cold, sand, and dust. Includes two 20-round magazines. Modeled after the legendary HK51 Chambered in the full-power 7.62x51mm NATO 8.3"" cold hammer-forged barrel with birdcage flash hider Stamped receiver Fully adjustable rear sight/fixed front Ambidextrous safety selector switch MP5-compatible wide handguard Includes 2 G3-pattern 20-round magazines"