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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.
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.
Other cartridges were derived from re-forming an existing case and possibly trimming the length in order to arrive at a case-shape that meets the standardized SAAMI-spec dimensions. AR-15: 22 Nosler : Proprietary, uses the head and rim dimensions of the 5.56x45, and a case-body that is similar to the 6.8 SPC case. To increase powder capacity ...
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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.
.22 Long Rifle (LR), the most common cartridge type of this caliber, often referred to simply as ".22 caliber" or "22" .22 Short , a cartridge used mostly in pocket pistols and mini-revolvers .22 Stinger, a variant of .22 LR with a slightly longer casing but identical overall cartridge dimensions (see CCI Stinger)
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
The .22 Nosler is designed to use the existing bolt face of an AR-15, and conversions to this caliber can be accomplished with a simple barrel swap. The shoulder is set back slightly compared to the 5.56 cartridge to prevent accidentally chambering a 5.56 cartridge in a .22 Nosler rifle.