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Attaching the barrel to the receiver using a barrel nut and a barrel with a shoulder is an alternative to action threads, which has been used in firearms such as the Sten gun and AR-15. Hand tools Quick barrel change systems is an increasingly popular alternative, as seen in for example SIG Sauer 200 STR , Roessler Titan or Blaser R8 .
The barrel threads a more conventional UN 1040 × 16 tpi; Longer barrel shank; Bedding Screws are now ¼ × 28 UNF. Bolt lug diameter increased; The opening movement of the bolt lightened by reducing the firing pin travel thus reducing the cocking cam angle. New bolt stop,
The barrel is threaded to fit the Ruger action threads. This way, a competent gunsmith only needs an AR-15 barrel wrench and proper headspace gauges to fit a new barrel. [ 14 ] This eliminates the need for machining by the gunsmith as with traditional barrel mounting solutions.
Right: Threaded barrel without choke insert. (For illustration only; a threaded barrel must never be fired without a properly inserted choke tube.) The marking is usually stamped on the underside of the barrel for older guns without choke tubes, or is spelled out in abbreviated text on the barrel near the gauge marking.
The Sport-22 featured a non-threaded barrel and a 10-round rotary magazine [2] to comply with the now expired 1994 U.S. firearms legislation which forbade the sale of the original TEC-22 model. [ 11 ]
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Smith & Wesson offers the M&P10 semi-automatic rifles in a variety of configurations tailored to specific shooting applications and styles. The standard model has a six-position collapsible stock, 4140 steel barrel, 7075 T6 aluminum receiver and a hard-coat black anodized finish.
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