Radical Firearms PA Exclusive 300 Blackout Pistol SBA4 Brace - 8.5''

Manufactured by Radical Firearms
SKU: PAP8.5-300-SBA4
MPN: PAP8.5-300-SBA4
Manufactured by Radical Firearms
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NOTE: Limit 1 per household. Quantities exceeding 1 will not allow checkout.

Items that are regulated by the ATF have restrictions and requirements: 
•Your entire order will ship only to a Federal Firearm License holder.
•Current processing time is approximately 14 to 16 days.
•Please contact your local FFL prior to placing your order to ensure they are still accepting transfers. Due to Covid-19 many are no longer open
•A copy of your order/invoice as well as the current FFL license for your local dealer must be emailed to ffl@primaryarms.com.



The Radical Firearms 300 BLK Pistol has been upgraded with the brand new SB-Tactical SBA4 5 position adjustable pistol brace. This arm brace is extremely durable and rigid with plenty of adjustment for different arm lengths and features a QD sling swivel slot for carrying or added stability when shooting off hand. It also allows for a proper cheek weld giving you a variety of ways to shoot your AR pistol. This model comes with an 8.5” barrel machined from 4140 Chrome Moly steel with a Melonite finish and the 1:8 twist rate is a good middle ground for shooting lightweight supersonic bullets and heavier subsonic bullets if you plan on running suppressed. The pistol length gas system is necessary to reliably cycle this cartridge and the M4 feed ramps help to feed each round into the chamber. The Radical Firearms .300 Blackout pistol paired with the SBA4 stabilizing brace make this gun extremely fun at the range.

  • 8.5” barrel chambered in .300 AAC BLK
  • Machined from 4140 steel with Melonite finish
  • Heavy barrel profile
  • 1:8 twist rate
  • Pistol length gas system
  • .750” low profile gas block
  • A2 flash hider
  • Forged 7075-T6 aluminum receivers
  • Type III anodized
  • 7” Primary Arms Exclusive M-LOK handguard
  • Mil-Spec parts kit
  • Ambidextrous safety and billet magazine button
  • Billet extended bolt catch
  • A2 pistol grip
  • SBA4 pistol arm brace

This 300 Blackout pistol features an upper and lower receiver forged out of 7075-T6 aluminum and a type III anodized finish for added durability and corrosion resistance. Even though is a larger caliber than typical AR-15’s, it uses all the same components allowing you to customize the pistol with your favorite aftermarket parts. However, it does come with an ambidextrous safety selector, and a billet machined magazine button. Also included is the Primary Arms exclusive handguard. This handguard comes with a few features of its own like an extremely durable barrel nut that free floats the barrel for better accuracy and indexes with the upper receiver to prevent it from rotating loose. It features lightening cuts to reduce weight and a continuous picatinny top rail for iron sights and other accessories. The M-LOK slots allow you to quickly add lights, grips, and rail segments to set up your PDW exactly the way you want, and the slim design is extremely comfortable to hold.

Radical Firearms offers law enforcement grade hardware. Crafted with quality materials and covered by their lifetime warranty, Radical Firearms is an outstanding choice for any budget.
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Barrel CoatingMelonite
Barrel ContourHBAR
Barrel Length8.5
Barrel LiningMelonite
Barrel Material4140 Chrome Moly Steel
BrandRadical Firearms
Caliber Gauge300 Blackout
Frame SizeAR Pistol
Gas System LengthPistol
Gas System TypeDirect Impingement
Handguard7 in M-LOK Rail
Thread Pattern5/8 X 24
Twist Rate1:8

WARNING: This Product can expose you to chemicals which is known to state of California to cause Cancer and Reproductive Harm. For more information, see www.p65warnings.ca.gov

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