LMT Monolithic 300 AAC Blackout 10.5" Pistol Length Bbl BLK
$554.40 at Brownells · 3 stores
In stock
AR-15/ 308 AR Stainless Steel Barrels - 300 AAC Blackout 1-8 Twist 16" Stainless Barrel
Proof Research · Barrels
No ratings yetBest price
$569.99at GunMag Warehouse
In stock checked Oct 1, 2026
Where to buy
| Store | Price | Availability | Buy | Add to build |
|---|---|---|---|---|
| GunMag Warehouse Best price | $569.99checked Oct 1, 2026 | In stock | Buy at GunMag Warehouse | |
| Brownells | $649.00checked Oct 1, 2026 | Out of stock | Buy at Brownells | |
| OpticsPlanet | $649.00Salechecked Oct 1, 2026 | Out of stock | Buy at OpticsPlanet |
Prices and availability change often, so confirm on the store's site before you buy. We may earn a commission from these links.
Price history
Lowest in-stock price in the last 30 days: $569.99 at GunMag Warehouse. Dashed line = out of stock. Tracking since Sep 28, 2026.
Show the prices as a table
| Store | Latest | Lowest | Highest |
|---|---|---|---|
| Brownells | $649.00 | $649.00 | $649.00 |
| GunMag Warehouse | $569.99 | $569.99 | $569.99 |
| OpticsPlanet | $649.00 | $649.00 | $649.00 |
Since Sep 28, 2026.
About this part
The AR-15/ 308 AR Stainless Steel Barrels - 300 AAC Blackout 1-8 Twist 16" Stainless Barrel is a 16" 300 Blackout barrel from Proof Research. It's sold by 3 stores (1 in stock), from $569.99 to $649.00. The lowest in-stock price in the last 30 days was $569.99 at GunMag Warehouse.
Fits and works with
- Caliber
- 300 Blackout · Shop matching ammo
- Bolt
- Standard AR-15 (5.56 / 300 BLK / .350 Legend) · Bolt carrier groups
- Barrel length
- 16" · Handguards
Specifications
- Manufacturer
- Proof Research
- Platform
- AR-15
- Caliber
- 300 Blackout
- Barrel length
- 16"
From the manufacturer
When PROOF Research joined Lawrence Barrels in 2012 they acquired 15 years of experience in manufacturing precision steel barrels. PROOF manufatures stainless steel barrels in-house with an absolute commitment to extreme accuracy and quality. They start with double stress-relieved 416R stainless steel, a pre-hardened chromium stainless steel ideally suited for use in precision, match-grade rifle barrels. 416R was specifically designed by engineers in collaboration with barrel makers and rifle manufacturers to provide the consistency, high quality and durability the firearms industry demands. 416R is the material of choice because it has the following characteristics: Excellen Mfg: Proof Research
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