Radical Firearms 16" 5.56 SOCOM Rifle - 15" Primary Arms Exclusive M-LOK Rail with B5 SOPMOD Stock and Type 23 Grip

Manufactured by Radical Firearms
SKU: PA16556SOC-B5
MPN: PA16556SOC-B5
Manufactured by Radical Firearms
1 Review

Out of Stock

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.
•A copy of your order/invoice as well as the current FFL license for your local dealer must be emailed to ffl@primaryarms.com.
•If this firearm includes magazines with a capacity higher than 10 rounds it may not be legal in your state. We will review all order prior to shipping and if your state does not allow the included magazines they will be removed.



A slight modification on one of our most popular complete rifles offered by Radical Firearms! This 16” 5.56 NATO SOCOM contour rifle is based around Radical Firearms’ Law Enforcement Upper Receiver for improved reliability and consistency with all your favorite parts. This rifle includes our exclusive Radical Firearms/Primary Arms M-Lok handguard, which offers both weight-savings and durability.

For the budget-minded, this rifle is a definite win, as it includes furniture from the popular B5 Systems. The B5 Systems SOPMOD stock recreates everything great about other SOPMOD stocks without the price tag. With a comfortable cheekweld, 6-positions of adjustment, and QD cups for sling attachment, the B5 Enhanced SOPMOD is one of the most popular stocks on the market, even for high end AR-15s. That’s why the military is quickly adopting B5 SOPMOD stocks onto many issued rifles. The Type 23 Pistol Grip is another noticeable upgrade over a standard rifle, as it improves the shooter’s wrist angle for modern shooting doctrine. An extended tang helps ensure proper indexing and aid in the overall ergonomics of your rifle.

Without a doubt, this is one of the most feature-packed—yet still affordable—offerings that Radical Firearms offers. The only thing you need to finish the build is a set of sights or an optic, which are all available right here at Primary Arms.

  • 16" 41V50 chrome moly vanadium steel SOCOM contour barrel
  • Chambered in 5.56 NATO with 1:7 twist rate
  • M16 cut bolt carrier group with Melonite finish
  • BCG high pressure tested and magnetic particle inspected
  • Standard charging handle
  • 1/2x28 A2 flash hider
  • 15" free float Radical Firearms/ Primary Arms Exclusive M-LOK Rail
  • MIL-SPEC single stage trigger
  • B5 Systems Type 23 Pistol Grip
  • B5 Systems Enhanced SOPMOD Stock

The Radical Firearms/Primary Arms Exclusive M-LOK Handguard. Crafted from 6063-T6 aluminum and hardcoat anodized a deep black, this tough, durable rail offer a slim, modular profile. Large cooling holes along the rail reduce weight and aid in rapid cooling. Take advantage of M-LOK positions along the 3, 6, and 9 o’clock of the rail for all your favorite gear. An uninterrupted M1913 Picatinny top rail offers space to mount optics, sights, and other accessories with ease.
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Barrel CoatingSalt Bath Nitride
Barrel ContourSOCOM
Barrel Length16
Barrel LiningSalt Bath Nitride
Barrel Material41V50 Chrome Moly Vanadium Steel
BrandRadical Firearms
Caliber Gauge5.56 NATO
Gas System LengthMid-Length
Gas System TypeDirect Impingement
Handguard15 in Radical Firearms/Primary Arms Exclusive M-LOK Rail
Muzzle DeviceA2 Flash Hider
Thread Pattern1/2 X 28
Twist Rate1:7

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

Ratings & Reviews

1 review

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Awesome rifle


Ordered this rifle and it was at my ffl in less then a week. Very satisfied with the fit and finish. Everything it tight and no rattling. Haven't got to fire it yet, with the ranges around here on lockdown.