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CMMG
Overview
The CMMG 5-inch barrel is designed specifically for .40 S&W, providing a compact and efficient option for builders looking to create a short-barreled rifle or pistol. Its QPQ/Nitride coating enhances durability and corrosion resistance, ensuring reliable performance even under rigorous use. This barrel is commonly used in builds that prioritize maneuverability and rapid handling, making it a solid choice for tactical applications.
Specifications
CMMG Barrel Sub-assm 5 Mt 4140CM SBN 40 S&w Only Compatible With Rdb BCG
Available Merchants(1)
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Build history on GunPartPicker
Builders on GunPartPicker first added the CMMG Barrel Sub-assm 5 Mt 4140CM SBN 40 S&w Only Compatible With Rdb BCG to a build in March 2026.
Availability is good: it was in stock at one retailer or another nearly every day in September 2026, and today the one retailer we track has it in stock. Prices barely moved in September 2026, holding around $274.95, so there haven't been real sales lately. Buying today, the lowest price is $274.95 at CMMG, which matches the best price we saw in September.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers
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