Radical Firearms 5.56 AR-15 Barreled Upper Receiver - Slim M-LOK Handguard - BMD Flash Hider - 16"

Manufactured by Radical Firearms
Manufactured by Radical Firearms
9 Reviews

In Stock

Standard orders will ship out in 1 business day (M-F) if ordered by 3:30 pm CST. FFL orders will ship within 5 business days or less as long as we have the information for the transfer destination. NFA items will take longer to ship and are dependent upon ATF processing times.

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This Radical Firearms 5.56 AR-15 Barreled Upper Receiver features a new M-LOK handguard with an ultra slim profile reducing weight and improving ergonomics. This free float handguard features M-LOK slots along the full length of the rail at the 3, 6, and 9 o'clock position with two slots at the 45 degree positions. The 16" barrel chambered in 5.56 NATO features a mid-length gas system, 1:7 twist rate, and an extremely effective BMD flash hider. Build your new AR-15 rifle today with this Radical Firearms barreled upper receiver group.


  • 16" 5.56 NATO barrel
  • BMD flash hider
  • Nitride finished barrel
  • 1:7 Twist rate
  • Slim M-LOK handguard
  • Black hardcoat anodized receiver and handguard
  • Mid-Length gas system
See More


Barrel CoatingSalt Bath Nitride
Barrel ContourSOCOM
Barrel Length16
Barrel LiningSalt Bath Nitride
Barrel Material4140 Chrome Moly Steel
BrandRadical Firearms
Caliber Gauge5.56 NATO
FinishHardcoat Anodized
Gas System LengthMid-Length
Gas System TypeDirect Impingement
Handguard15 in M-LOK Rail
Muzzle DeviceFlash Hider
Thread Pattern1/2 X 28
Twist Rate1:7
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

9 reviews

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Great Value


Bought this upper for a personal build a couple of months back. Let 2 buddies try it at the range and now they've ordered this upper for themselves!

Great grouping at various distances, goldilocks weight and good looking to boot!

Excellent Upper for the Sale Price

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Purchased 2 of these on a great sale, to convert 2 AP Pistol Braced firearms into rifles with 16 inch barrels. Quality seems very good. Early accuracy testing showed some ridiculously tight groups with factory PMC Bronze 55g ammo. Will be taking them both to 100 yard range soon. One had hand guard on a little off, but it was a 2 minute fix. Own one other Radical Firearms factory built rifle, and it is also a great gun and it was on sale at a great price. Products shipped one day after order.... great job again Primary Arms. Extremely well packaged for shipment too.

Great Upper at a Great Sale Price!!

by -

Solid upper with the slim hand guards and BMD flash hiders. Units were well packaged for shipment and arrived quickly. Finish is perfect on both uppers and components are installed perfectly. Bolts and "T" handles installed easily and locked up beautifully. I have not had a chance to fire them to test accuracy but believe they will shoot just as good as they look. Thank you for a pair of solid quality uppers for an excellent price and reasonable shipping costs to boot!

Radical Upper

by -

Looks great feels great now I just gotta try it.

Great Value


I just got this on Saturday. Fast shipping. Looks great. Everything dropped in from my other rifle very nice. Haven't fired yet, but going to soon.

Great Upper!!

by -

Over the years, I have purchased several Radical Firearms uppers. Each time the build quality and durability was impressive especialy for the price.
Primary Arms shipped both super fast.
No complaints.

Wow! Great deal!

by -

For $189.00 this is the BEST value for that price even if the price was higher. Bought this not expecting much honestly but, I have to say, for this price, this is top notch. If you're considering buying an upper or you would like to dip your toes into buying and building your own AR-15 then, this is the way to go. If you purchased the cheapest versions of all the parts on this separately, you'd still pay about the same and you wouldn't be getting anything near the quality this one has. I'm a gunsmith, 20+ years of experience, I build Ar's from scratch all the time and I have to say this is IMPRESSIVE! If I were to purchase individual items using my wholesale prices that are a match to this upper, it would cost me more than this upper and I'd have to do the work of putting it together. (Not that it's hard for me to put them together having built so many but it's, no extra work AND a lower price) win- win


by -

Amazing product came safely packaged! also I love the detail that it came with stickers. 10/10 quality worth for a Budget AR-15 5.56 build strongly recommend this complete upper!!!! GREAT QUALITYYYYY!

Excellent service from PA!!

by -

I became a regular client of PA for one reason: they package and ship while you pay for it. I received all my orders in a matter of 2 days. Other vendors take 1 week for processing alone.
As far as this upper, I've bought 4 so far to fix my pistol brace issue. You can’t go wrong with that sale price.
Excellent packaging, sturdy hand guard, acceptable finish.
You will not find a better value for the price at the moment.