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Brownells BRN-PROTO 5.56 Nato Rifle - 20"

AR-15 Rifle

Out of stock

FFL Required Before Shipping.
Please have your dealer email a copy of their FFL to [email protected] or fax it to 253-218-2998, referencing your name and order number.

Special Price $999.00 Regular Price $1,624.99

Step into the Wayback Machine and go back to the beginning of the AR-15 with Brownells BRN-PROTO® - a faithful replica of the Eugene Stoner's very first AR-15 prototype. 

If you're an AR-15 aficionado or collector, the BRN-PROTO® is a rifle you should not be without! Based on AR-15 Serial Number One, the Brownells' BRN-PROTO® sports a wealth of unique, historically-accurate features you will not see on later AR-15 / M16 models.

First, the BRN-PROTO® has the distinctive trigger-like charging handle on top of the receiver, under the carry handle, just like the early AR-10 models (remember, the AR-15 was developed second.). It has the uncluttered “slick-side” upper receiver of the early rifles and stock, handguard, and pistol grip of brown reinforced polymer that replicates the look - but not the weaknesses - of the original fiberglass furniture. If the round cross-section handguard looks oversized, that's because it is. Just as the original was a "borrowed" AR-10 'guard, it's actually lifted from their BRN-10 .308 rifles!

The BRN-PROTO AR-15 gives you the looks and functionality of the original without the drawbacks. It is constructed of the latest materials using the latest manufacturing techniques, so you have an robust rifle that's ready to put a LOT of rounds down range. Internal dimensions conform to modern "mil-spec" standards, so the BRN-PROTO® is compatible with off-the-shelf upgrade and replacement parts.


  • Chambered for modern 5.56x45mm NATO (.223 Remington compatible) ammunition
  • Robust forged/machined 7075 T6 aluminum receivers
  • Matte gray anodizing
  • 20" barrel with 1-12" rifling
  • Rifle-length gas tube
  • Chrome-plated bolt / carrier group
  • Includes:
    • (1) 25rd Magazine
    • (1) GI Operations Manual
    • (1) Chamber Flag


  • Action Type: Direct Impingement
  • Barrel Length: 20"
  • Twist Rate: 1:12
  • Cartridge: 5.56 mm NATO
  • Finish: Anodized Matte Gray
  • Front Sight: Fixed
  • Length: 40"
  • Magazine Included: 25rd Magazine
  • Muzzle: Duckbill Flash Hider
  • Rear Sight: Adjustable
  • Stock Material: Polymer
  • Weight: 6lbs 11oz
More Information
Product Type AR-15 Rifle
Manufacturer Brownells
Thread Pitch 1/2x28
Gas Length Rifle
Finish Gray
Barrel Length 20"
Caliber 5.56 NATO