Click to see full view
Brownells
Overview
The Brownells BRN-4 BARRELS 5.56X45MM is a barrel. Compare prices from multiple merchants and find the best deal.
Specifications
Available Merchants(1)
Prices checked
Price Alert
Build history on GunPartPicker
Availability is good: it was in stock at one retailer or another nearly every time we checked in October 2026, and today the one retailer we track has it in stock. Prices barely moved in October 2026, holding around $179.99, with no real sale all month. Buying today, the lowest price is $179.99 at Brownells, which matches the best price we saw in October.
Prices checked · refreshed daily across 37 retailers
Not sure which barrel to pick?
We ranked every barrel by how often it shows up in real builds on GunPartPicker.
Read the guide: AR-15 Barrel Length & Brand Report →Check it against the live catalog:
Frequently Built With
Popular alongside barrels on GunPartPicker
Bravo Company Mfg Upper Receiver Assembly w/ Laser T-Markings, Hard Coated Anodized - 4-UR-M4
Aero Precision Stripped M4E1 AR-15 Lower Receiver - Special Edition - Freedom
Maximize Your AR-15's Potential with Tacfire's 15" ACE M-LOK Handguard - Black Excellence - HG20-15
Radian Raptor Charging Handle & Talon Safety Selector Combo - OD Green
Bravo Company M16 Bolt Carrier Group Black
Geissele Automatics AR-15 SSA-E X Lightning Bow Trigger
Builds Featuring This Part
See all builds →Builds in the community that include the BRN-4 BARRELS 5.56X45MM
| Build | Parts | Total |
|---|---|---|
 | 18 | $4511.44 |
No reviews yet. Be the first to review this product!