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Smith & Wesson announced their first short-stroke gas piston action rifle, the M&P15 PS and PSX in January 2009. [15] The M&P15 Sport and M&P15 Whisper were released in 2011. [16] The M&P10, a version of the AR-10, was introduced in 2013. [17] The M&P15 Sport II was introduced in 2016.
In 2008, Smith & Wesson introduced new versions of the M&P: the M&P45 Mid-size, the M&P45 Compact, the M&P9L, and the M&P Pro Series. The M&P45 Mid-size sports a 102 mm (4.0 in) barrel and a full-sized grip, and the M&P45 Compact targets the concealed carry market with its 4" barrel and shorter grip (with eight or ten-round capacity).
The M&P15-22 was designed to be a less expensive alternative for training with an AR-15 style rifle, as the rifle itself is much less expensive than most AR-15s, and the .22 LR ammunition is often much less expensive than the .223 Remington/5.56×45mm NATO. The rifle features a safety and bolt lock that operate just like an AR-15's.
A powder with a slower burning rate is used to make the most use of the length of a rifle barrel. Most .22 long rifle powders increase velocity up to about 19 in (480 mm) of the barrel. The powder used in the Stinger increases velocity up to the longest .22 barrel length tested by the NRA, 26 in (660 mm). [23]
15–5, 1986 Introduction of 6” and 8-3/8” barrel; 15–6, 1988 New yoke retention system/ radius stud package/hammer nose bushing; 15–6, 1988 Discontinue 8-3/8” and 2” barrel; 15–6, 1992 Discontinue 6” barrel, blue finish only; 15–7, 1994 Synthetic grips introduced, drill and tap frame, change rear seat leaf, change extractor
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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.
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