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AAC .300BLK 12.5" Rifles


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We ran accross an old stash of AAC MPW's in .300BLK with the 12.5" barrels sitting in the warehouse.  There are only a handful of these SBR's and the price will move them quickly.  Don't wait around to buy one!

Complete 300 AAC BLACKOUT Short Barreled Rifle

  • 12.5" Nitrided 1:7: twist barrel, threaded 5/8-24
  • AAC 51T BLACKOUT™ Flash Hider
  • Nickle boron (Ni-B) "Full Auto" rated BCG
  • Knights Armament URX 3.1 rail
  • Geissele trigger
  • Magpul furniture
  • Carbine receiver extension
  • Standard GI buffer spring
  • H2 buffer
  • Includes one 30rnd P-Mag (State Restrictions Apply)
  • Don't forget: SBR registration will require a tax stamp as well

Silencer Shop Note

If you've been reading our blog, watching our YouTube or attebded any of our events, then you've seen these things in action.  Silencer Shop has been using AAC MPW rifles in 5.56 and .300BLK for testing/evaluation/demonstration for years.  They are excellent products.

From The Manufacturer

Advanced Armament Corporation complete MPW rifles are available in 16” and 12.5” barrels chambered for 300 AAC BLACKOUT. (*All NFA rules apply)

A 30 caliber rifle the size of an AR15 5.56mm caliber rifle - without a reduction in magazine capacity. The AAC MPW in 300 AAC Blackout uses ordinary 223/5.56mm  magazines for a full 30 round capacity, and is available in 12.5, and 16 inch barrels.*

Components are of premium quality. The 1:7 twist barrel is nitrided to provide extreme corrosion resistance and high hardness for a long life - outperforming chrome-lined barrels for longevity without the potential impediments to accuracy. The muzzle is threaded 5/8-24 and includes an AAC 51-tooth BLACKOUT™ flash suppressor with the complete upper. A Knight’s Armament free-floating URX III helps maintain accuracy while providing for the mounting of accessories. The bolt carrier group’s nickel boron (Ni-B) UCT EXO coating has a very high hardness and lower friction than either chrome or nickel teflon. There is also a base layer of high-phosphorous electroless nickel that ensures the extreme corrosion protection that is absent from other Nickel Boron carriers that use a single, thinner layer. The bolt itself is Carpenter 158® phosphated shot-peened steel to ensure precise dimensions with no concerns for hydrogen embrittlement in the critical lug area. A special green o-ring that is tested to not bind even at -40 degrees F is standard. The extractor spring is made from premium ultra-strong wire and is a low fatigue design to ensure the longest possible life. The extractor pin made from 300 ksi S2 tool steel - not the much lower strength S7 more commonly used. 

Finally, a properly-staked carrier-key with Permatex® gasket-seal compound ensures no gas leakage. The trigger is a Geissele for great feel and reliability, and the stock and pistol grip by MagPul Industries. One magazine is included. Optics, mounts, and silencer are not included.

The recommended optional sound suppressor is the AAC 762-SDN-6™, which provides an average of 39.3 dB reduction with subsonic ammunition.


Specification Information

Caliber Rating .300 BLK
Thread Pitch 5/8x24
Color Black
Manufacturer AAC
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AAC .300BLK 12.5" Rifles

SKU: AAC 102869

Complete 12.5" SBR in .300BLK

Availability: In stock



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