Radical Firearms AR-15 Rifle 16" .458 SOCOM - 15" M-LOK MHR Rail

Manufactured by Radical Firearms
SKU: FR16-458SOC-15MHR3
MPN: FR16-458SOC-15MHR
Manufactured by Radical Firearms
3 Reviews
$649.99 $784.30

In Stock

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Items that are regulated by the ATF have restrictions and requirements: 
•Your entire order will ship only to a Federal-Firearm License holder.
•Please contact your local FFL prior to placing your order to ensure they are still accepting transfers.
•A copy of your order/invoice as well as the current FFL license for your local dealer must be emailed to ffl@primaryarms.com.



Radical Firearms 458 SOCOM AR-15 is a big bore semi-automatic hunting rifle that offers a versatile selection of ammunition types to shoot including heavy subsonic. The 16” 4140 CMV, HBAR profile barrel features a 1:14 twist rate that maintains the accuracy of the .458 SOCOM round out to long distances. This big bore AR is outfitted with an MHR free-float handguard with a full-length picatinny rail that allows you to customize your optic/accessory set-up. 458 SOCOM is a hard hitting round so Radical Firearms has chosen their Panzer Brake that keeps the muzzle flatter and gives the rifle a fierce artillery look. Radical Firearms 458 SOCOM AR-15 comes with some enhanced parts such as an ambidextrous safety selector, extended magazine release button, MFT pistol grip and an Adaptive Tactical Stock.

  • 458 SOCOM
  • 16” 4140 CMV Barrel
  • 15” Free Float MHR M-LOK Handguard
  • 1:14 Twist Rate
  • Panzer Muzzle Brake
  • Forged 7075 T6 Upper and Lower Receiver
  • Adaptive Tactical Stock (6 Positions)
  • Made in Stafford Texas, U.S.A.
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Barrel Coating
Barrel ContourHBAR
Barrel Length16
Barrel LiningMelonite
Barrel Material41V50 Chrome Moly Vanadium Steel
BrandRadical Firearms
Caliber Gauge.458 SOCOM
FinishHardcoat Anodized
Gas System LengthCarbine
Gas System TypeDirect Impingement
Handguard15 in M-LOK Rail
Magazine Capacity10
Muzzle DeviceMuzzle Brake
Twist Rate1:14
California Prop 65 warning

 WARNING: This product can expose you to chemicals, which are known to the State of California to cause Cancer and Reproductive Harm. For more information go to www.P65Warnings.ca.gov.

Ratings & Reviews

3 reviews

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Radical Arms Socom .458 Purchase

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I have built and still own 12 AR's of various calibers and configurations. I purchased the Radical Arms Socom .458 to ad a big bore AR for hunting hogs in Texas. I picked it up from my FFL today and I am really impressed with the quality and workmanship in this AR. I could not build one better than this one. The pivot pins were both smooth and easy to break down. The attention to detail was very impressive and the trigger pull was better than most of the stock AR systems I have tried. I have drop in triggers on all my ARs but plan to leave this one alone. Very happy with my purchase. I will repost after taking it to the range but from what I see it should shoot as good as it looks! It even has a double ambi safety on it!

My gun


Just got my radical firearms.458 amazing gun built amazing shoots amazing definitely worth it

Just buy it


I’ve had a radical 458 for almost 6 years now. After the 25 round break in period and a little modification to the mag the thing has run flawlessly with 300gr and 325gr bullets. It’s had over 1000 full power rounds through it and runs flawless. Buy one of these and laugh at your buddies little mouse 5.56 rifle. You won’t regret it.