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CMMG
Overview
The CMMG MKGS Barrel is a 9-inch barrel designed specifically for 9mm AR builds, featuring a twist rate of 1:9. This twist rate is well-suited for stabilizing various bullet weights, allowing builders to tailor their ammunition choices for different shooting applications. Commonly found in compact and pistol-caliber carbine builds, this barrel provides an efficient balance of maneuverability and performance.
Specifications
Available Merchants(5)
Prices checked
Price Alert
Build history on GunPartPicker
Builders have been adding the CMMG MKGS Barrel 9mm 5" Black 1:9 AR Rifles - 99D17C3 to their builds on GunPartPicker since June 2026. All time, it ranks #116 of the 828 barrels builders have added.
It was hard to find in September 2026, in stock on only 10 of the 28 days we checked, and today only Sportsman's Guide has it in stock. It dipped to $346.17 at BattleHawk Armory for a stretch in September 2026, well under its usual $396.99, so sales do come around. Buying today, the lowest price is $399.99 at Sportsman's Guide, above September's low of $346.17, 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
Spike's Tactical Flat Top Upper w/ Ejection Port Door, 9MM, Black - SFT902D
Aero Precision .936 Low Profile Gas Block, Aero Logo - Nitride
Aero Precision Gas Tube, Pistol Length - Stainless Steel
Aero Precision AR-15 Breach Charging Handle Ambidextrous Small Levers
Sharps Bros Showdown Stripped Lower Receiver - Black, Unique Design and High-Performance for Custom AR Builds - SBLR11
SIG SAUER MPX HANDGUARD Drop-In M-LOK
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