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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.
The rifle has different models that come chambered in 5.56mm NATO/.223 Remington, .22 Long Rifle, and 5.45×39mm. The barrels come with either a melonite lined or chrome-lined 4140 steel rifling, and 7075 T6 aluminum receiver with a hard-coat black anodized finish.
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.
Heckler & Koch provides a special scraper tool for the .22 LR-barrel. The tool is needed to clean the inside of the floating chamber for safe operation. An additional exchange tool is provided for all calibers to screw and unscrew the barrel nut that attaches the barrel to the frame. Both tools can be seen in one of the pictures of the P7K3 on ...
The 15-2 used a roll pin inserted into the frame as a centering dowel combined with a precisely drilled hole in each shroud assembly to facilitate proper shroud centering and alignment, thus eliminating the need for flanged barrel shrouds. The 15-2 introduced more barrel and shroud options, including barrel/shroud lengths of 2.5, 4, 6, 8, 10 ...
Drilling: A firearm with three barrels (from the German word drei for three). Typically it has two shotgun barrels in a side-by-side configuration on the top, with a single rifle barrel underneath. Drum magazine: A type of firearms magazine that is cylindrical in shape, similar to a drum. Dry fire: the practice of "firing" a firearm without ...