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.300 Blackout Barrels

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Rainier Arms Ultramatch MOD2 300BLK AR-15 Barrel - 10" Polished

$400.00
Starting at 0% APR or $73.83/mo with . Learn More

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Rainier Arms Ultramatch MOD2 300BLK AR-15 Barrel - 10" Satin

$400.00
Starting at 0% APR or $73.83/mo with . Learn More

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Boss Barrels Carbon Fiber 300 BLK AR-15 Barrel - 10.5"

$495.00
Starting at 0% APR or $91.37/mo with . Learn More

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Rainier Arms Match 300BLK AR-15 Barrel - 8.5" Nitride

$260.00
Four Payments of $65.00 with . Learn More

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Rainier Arms Match 300BLK AR-15 Barrel - 10.5" Nitride

$260.00
Four Payments of $65.00 with . Learn More

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Ballistic Advantage Modern Series 300BLK AR-15 Barrel - 9"

4.5 star rating 2 Reviews

$152.00
Four Payments of $38.00 with . Learn More

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Spinta Precision AR-15 300BLK Cold Hammer Forged Barrel - 8" (Limited Production)
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4.8 star rating 30645 Reviews

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Verified Reviewer

0.0 star rating

07/10/25

Review by Anonymous User

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07/10/25

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Steven R.
Verified Buyer

5.0 star rating

07/09/25

Loose mag fit on 5. 7 builds

Review by Steven R. on 9 Jul 2025 review stating Loose mag fit on 5. 7 builds
If you build a 5. 7 be prepared for a VERY loose fitting magazine. I cured that with a cut off brass machine screw I threaded into a drilled and tapped hole in the front edge of the mag. Now she's tight. RANIER had the best price and picked up the ball when USPS lost my package (again, bastards), Someone will own a fine custom gun soon. Wish I could post pics.

On Sharps Bros Hellbreaker AR-15 Lower Receiver - Gen 2

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07/09/25

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Beau W.
Verified Buyer

5.0 star rating

07/09/25

A Functional Flash Suppressor

Review by Beau W. on 9 Jul 2025 review stating A Functional Flash Suppressor
You can't even see a flash from the shooter's perspective firing at dusk through a . 357 lever gun. , and it's a rosebud to anyone else. I like it a lot.

On Next Level Armament 9mm Hi-Helix Flash Hider

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07/09/25

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Jason Y.
Verified Reviewer

5.0 star rating

07/08/25

18" mod 2 223 wylde ultramatch

Review by Jason Y. on 8 Jul 2025 review stating 18" mod 2 223 wylde ultramatch
Okay so barrel is broken in. This barrel is unbelievably accurate. Printed groups at 100,300,500 today and the verdict is in. WOW! 100 yards 3 shot measured 3/8", 300 yard 3 shot 7/8" and 500 yard measured under 2". Absolutely incredible. More accurate that most big bolt guns.

On Rainier Arms Ultramatch MOD2 .223 Wylde AR-15 Barrel - 18" Nitride

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07/08/25

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Raul
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5.0 star rating

07/08/25

RAINIER ARMS AR-15 FORGED LOWER RECEIVER

Review by Raul on 8 Jul 2025 review stating RAINIER ARMS AR-15 FORGED LOWER RECEIVER
RAINIER ARMS AR-15 FORGED LOWER RECEIVER - hands down one of the tightest fitting receiver when paired with Rainier Arms forged upper receiver! I had to use a mallet to take it apart! Anodizing was perfect with deep black finish! Would definitely recommend!

On Rainier Arms AR-15 Forged Lower Receiver

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07/08/25

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Tony P.
Verified Buyer

5.0 star rating

07/07/25

Nomad Frames Rock. . !!

Review by Tony P. on 7 Jul 2025 review stating Nomad Frames Rock. . !!
Nomad Frames Rock. . !!

On Nomad 9F Enhanced Frame For Glock 17 Gen 5

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07/07/25

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Special Price $149.99 Regular Price $199.99

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V Seven Weapon Systems 300BLK AR-15 Fluted Barrel w/ Ti Gas Block - 6.5"

5.0 star rating 4 Reviews

$395.76
Four Payments of $98.94 with . Learn More

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Faxon Firearms Duty Series Gunner 300BLK AR-15 Barrel - 10.5"

4.9 star rating 8 Reviews

$151.80
Four Payments of $37.95 with . Learn More

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Noveske Stainless Lo-Pro Gas Block 300BLK AR-15 Barrel - 10.5" w/ HS Bolt

5.0 star rating 1 Review

$408.50
Starting at 0% APR or $75.40/mo with . Learn More

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Faxon Firearms Duty Series Gunner 300BLK AR-15 Barrel - 7.5"

5.0 star rating 4 Reviews

$142.60

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Faxon Firearms Match Series Gunner 300BLK AR-15 Barrel - 6"

$170.20
Four Payments of $42.55 with . Learn More

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Faxon Firearms Match Series Gunner 300BLK AR-15 Barrel - 7.5"

$170.20
Four Payments of $42.55 with . Learn More

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Faxon Firearms Gunner 300BLK AR-15 QPQ Barrel - 16"

$165.60
Four Payments of $41.40 with . Learn More

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Rainier Arms Select 300BLK AR-15 Barrel - 6.5"

4.5 star rating 4 Reviews

$195.00
Four Payments of $48.75 with . Learn More

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Ballistic Advantage Modern Series 300BLK AR-15 Barrel - 10.5"

$156.75
Four Payments of $39.19 with . Learn More

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