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Colt
Overview
The Colt M4cqb Replacement Barrel Assembly features a 10.3-inch M4 profile, specifically designed for 5.56 NATO caliber firearms. With a twist rate of 1:7, this barrel effectively stabilizes a range of bullet weights, making it suitable for various loads, while the carbine-length gas system ensures reliable cycling in compact builds. This barrel is commonly found in short-barreled rifles (SBRs) and other builds that prioritize maneuverability without sacrificing performance.
Specifications
Available Merchants(4)
Prices checked
Price Alert
Build history on GunPartPicker
Builders on GunPartPicker first added the Colt M4CQB Replacement Barrel Assembly 10.3in to a build in March 2026.
Availability is good: it was in stock at one retailer or another nearly every day in September 2026, but today only Brownells has it in stock. It dipped to $280.79 at BattleHawk Armory for a stretch in September 2026, under its usual $299.99, so sales do come around. Buying today, the lowest price is $299.99 at Brownells, above September's low of $280.79, so a better deal may come back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers
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Frequently Built With
The part most often added in each category by the builds that include this one
LMT Upper Receiver Assembly - AR-15 - M4 - Black Anodize
Luth-AR AR-15 A2 Mid-Length 9" Handguard Black
WMD Guns AR-15 Gas Tube Nitromet Mid-Length
Magpul MOE SL-M Carbine Stock Mil-Spec OD Green
Spikes Tactical Upper/Lower Receiver .223 Remington AR Lower, Flat Dark Earth - STS1512
LMT Piston Full Auto 5.56 AR-15 Bolt Carrier Group
Build Configuration Breakdown
Aggregated and anonymized data showing how builders use this product
PlatformBased on real build data showing which platform (AR-15, AR-10, AR-9) builders pair with this product.
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