CMMG .300 Blackout 16.1" Medium Taper Barrel Sub-Assembly, Salt Bath Nitride Black - 30D120A
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CMMG
Overview
The CMMG .300 Blackout 16.1" Medium Taper Barrel Sub-Assembly is designed for optimal performance with the .300 Blackout cartridge, featuring an M4 profile that balances weight and rigidity. With a pistol-length gas system and a 1:7 twist rate, this barrel offers reliable cycling and stabilization of heavier projectiles, making it an excellent choice for both supersonic and subsonic loads. This barrel is commonly found in builds aimed at tactical applications or those seeking versatility in ammunition types.
Specifications
CMMG .300 Blackout 16.1" Medium Taper Barrel Sub-Assembly, Salt Bath Nitride Black - 30D120A
August 2026 on GunPartPicker
CMMG .300 Blackout 16.1" Medium Taper Barrel Sub-Assembly, Salt Bath Nitride Black - 30D120A ranked #97 of the 298 barrels builders added on GunPartPicker in August 2026. Builders have been adding it to their builds on GunPartPicker since March 2026. All time, it ranks #73 of the 780 barrels builders have added.
It was in stock most days in August 2026, and today 4 of the 8 retailers we track have it in stock. It dipped to $149.85 at BattleHawk Armory for a stretch in August 2026, well under its usual $183.96 to $215.38, so sales do come around. Buying today, the lowest price is $176.99 at Ammunition Depot, above August's low of $149.85, so a better deal may come back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 31 retailers
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Frequently Built With
The part most often added in each category by the 4 builds that include this one
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