Rosco Manufacturing Bloodline 300 Blackout AR-15 Barrel Heavy Pistol - 8.2"

Rosco Manufacturing Bloodline 300 Blackout Ar-15 Barrel Heavy Pistol - 8.2" - Barrel for AR-15 - view 1
Rosco Manufacturing Bloodline 300 Blackout Ar-15 Barrel Heavy Pistol - 8.2" - Barrel for AR-15 - view 2
Rosco Manufacturing Bloodline 300 Blackout Ar-15 Barrel Heavy Pistol - 8.2" - Barrel for AR-15 - view 3
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Rosco Manufacturing

Overview

The Rosco Manufacturing Bloodline 300 Blackout AR-15 Barrel is designed for pistol builds, featuring an 8.2-inch length that optimizes maneuverability while maintaining performance. With a SOCOM profile and a twist rate of 1:7, this barrel effectively stabilizes heavier projectiles, making it ideal for subsonic and supersonic ammunition alike. Commonly found in pistol setups, it is a solid choice for builders looking to enhance their 300 Blackout configurations.

Specifications

MPNBL-82-HB-300BLK-7-P
Gas System LengthPistol
Barrel ProfileSOCOM
PlatformAR-15
Action TypeSemi-Auto
ColorBlack
ComplianceStandard
Thread Pitch5/8x24
Caliber300 Blackout
Barrel Length8.2
CoatingQPQ/Nitride
Twist Rate1:7

Available Merchants(7)

Prices checked

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Ammunition Depot logo
Ammunition Depot
~$28.90 est. shipping
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In Stock
$118
Optics Planet logo
Optics Planet
Free shipping
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In Stock
$139
Primary Arms logo
Primary Arms
Free shipping
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In Stock
$146
KY Gun Company logo
KY Gun Company
Flat rate shipping
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In Stock
$147
BattleHawk Armory logo
BattleHawk Armory
Shipping varies
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In Stock
$153
Palmetto State Armory logo
Palmetto State Armory
Free shipping
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In Stock
$154
Brownells logo
Brownells
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Out of Stock
$110

Build history on GunPartPicker

Builders on GunPartPicker first added the Rosco Manufacturing Bloodline 300 Blackout AR-15 Barrel Heavy Pistol - 8.2" to a build in March 2026.

It was in stock most days in August 2026, and today 6 of the 7 retailers we track have it in stock. The best price drifted down from $145.80 to $109.99 over August 2026 without a real sale. Buying today, the lowest price is $118.49 at Ammunition Depot, above August's low of $109.99, so a better deal may come back.

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Builds Featuring This Part

See all 4 →

Builds in the community that include the Rosco Manufacturing Bloodline 300 Blackout Ar-15 Barrel Heavy Pistol - 8.2"

BuildPartsTotal
8.2" Aero Precision clone build
8.2" Aero Precision clone
13$744.91
LMT 8.2" 300 Blackout build
LMT 8.2" 300 Blackout
14$3567.71
8.2" build build
8.2" build
19$2914.54
SBR 8.2" 5.56 build
SBR 8.2" 5.56
13$1204.80

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