The M17s rifle is gas operated weapon that uses short-stroke gas piston, located above the barrel. Locking is achieved by rotary bolt with seven lugs; bolt is hosted in massive Ar-18-style bolt carrier, which rides on dual guide rods. The charging handle is somewhat unusual as it forms the rear part of the integral carrying handle, and therefore it is fully ambidextrous. The cocking handle slot on the top of receiver is covered by sliding dust cover. The receiver of weapon is a composite affair, consisting of extruded aluminum upper part and polymer lower part. Upper part houses barrel, gas system and bolt group. Lower receiver is made integral with pistol grip and houses trigger unit and magazine housing. Upper and lower receivers are connected by two push-out cross-pins. Ejection port is made on the right side of the weapon only, and there's no provisions for left-hand ejection. Nevertheless, weapon is more or less ambidextrous in regard to controls, as push-button safety (located at the front of triggerguard) and magazine release buttons are made ambidextrous too. M17s will accept all M16 / Ar-15 type magazines. The top of the carrying handle is fitted with Weaver-style accessory rail which will accept any compatible scope mounts, and also hosts a rudimentary backup open sight.
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