Rosco Manufacturing

Rosco Manufacturing 5.56/300BLK Bolt Carrier Group - Phosphate

Rosco Manufacturing 5.56/300BLK Bolt Carrier Group - Phosphate - Bolt Carrier Group for AR-15 - view 1
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Rosco Manufacturing

Overview

The Rosco Manufacturing 5.56/300BLK Bolt Carrier Group is designed for reliable operation in both 5.56 NATO and 300 Blackout builds. Its phosphate finish provides a durable surface that helps resist wear and corrosion, ensuring smooth cycling and longevity under various conditions. This BCG is commonly found in tactical and precision builds where dependable performance is essential.

Specifications

MPNROS-BCG-002
Caliber5.56 NATO
FinishPhosphate

Available Merchants(5)

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KY Gun Company logo
KY Gun Company
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$166
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Ammunition Depot logo
Ammunition Depot
~$28.90 est. shipping
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$169
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Optics Planet logo
Optics Planet
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$172
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Brownells logo
Brownells
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$144
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BattleHawk Armory logo
BattleHawk Armory
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$144
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Build history on GunPartPicker

Builders have been adding the Rosco Manufacturing 5.56/300BLK Bolt Carrier Group - Phosphate to their builds on GunPartPicker since March 2026. All time, it ranks #295 of the 445 bolt carrier groups builders have added.

Availability is good: it was in stock at one retailer or another nearly every day in August 2026, and today 3 of the 5 retailers we track have it in stock. The best price drifted down from $159 to $144 over August 2026 without a real sale. Buying today, the lowest price is $165.74 at KY Gun Company, above August's low of $144, so a better deal may come back.

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Frequently Built With

The part most often added in each category by the 3 builds that include this one

Battle Arms Development AR-15 Enhanced Bolt Stop, Black

Battle Arms Development AR-15 Enhanced Bolt Stop, Black

Bolt Catch$34in 2 builds
Rosco Manufacturing K9 5.56 NATO Sage Dynamics Patrol Length AR-15 Barrel - 12.5"

Rosco Manufacturing K9 5.56 NATO Sage Dynamics Patrol Length AR-15 Barrel - 12.5"

Barrel$175in 1 build
Battle Arms Development Workhorse Stripped Lower Receiver 5.56 NATO / .223 Rem

Battle Arms Development Workhorse Stripped Lower Receiver 5.56 NATO / .223 Rem

Lower Receiver$125in 1 build
Aero Precision Enhanced M-LOK Handguard Gen 2 10.7" Black

Aero Precision Enhanced M-LOK Handguard Gen 2 10.7" Black

Handguard$145 · out of stockin 1 build
Strike Industries T-Bone AR-15 Charging Handle for .223/5.56 - Black/Black

Strike Industries T-Bone AR-15 Charging Handle for .223/5.56 - Black/Black

Charging Handle$35in 1 build
Strike Industries Billet AR-15 Magazine Release Catch - Red

Strike Industries Billet AR-15 Magazine Release Catch - Red

Magazine Release$19in 1 build

Builds Featuring This Part

See all 2 →

Builds in the community that include the Rosco Manufacturing 5.56/300BLK Bolt Carrier Group - Phosphate

BuildPartsTotal
16" 5.56 build
16" 5.56		21$2146.96
12.5" spike's tactical build build
12.5" spike's tactical build		15$1218.99

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