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CMMG
Overview
The Cmmg AR-15 Gas Block Assembly is a low profile component designed for a .750-inch gas block diameter, making it a reliable choice for standard gas systems. Constructed from steel and finished with a nitride treatment, this gas block effectively channels gas from the barrel to cycle your action while maintaining a streamlined profile that fits under handguards without adding bulk. This assembly is often found in builds utilizing a carbine gas system, particularly for those chambered in 5.56 NATO.
CMMG AR-15 Gas Block Assembly, Low Profile, .750 ranked #14 of the 75 gas blocks builders added on GunPartPicker in August 2026. Builders have been adding it to their builds on GunPartPicker since February 2026. All time, it ranks #18 of the 177 gas blocks builders have added.
Availability is good: it was in stock at one retailer or another nearly every day in August 2026, and today 11 of the 12 retailers we track have it in stock. The best price crept up from $29.28 to $38.08 over August 2026. Buying today, the lowest price is $31.75 at BattleHawk Armory, above August's low of $29.28, so a better deal may come back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 35 retailers
We ranked every gas block by how often it shows up in real builds on GunPartPicker.
Read the guide: AR-15 Gas Block Guide →Check it against the live catalog:
The part most often added in each category by the 21 builds that include this one
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Radian Weapons AR-15 Raptor-SD Ambidextrous Charging Handle OD Green
Midwest Industries Quad Rail AR-15 Handguard - 15"
Builds in the community that include the Cmmg Ar-15 Gas Block Assembly, Low Profile, .750
| Build | Parts | Total |
|---|---|---|
 | 22 | $1415.78 |
 | 20 | $802.16 |
 | 19 | $3849.04 |
| 17 | $1808.23 |
 | 15 | $2864.36 |
 | 19 | $1444.29 |
 | 17 | $2294.47 |
 | 24 | $3258.09 |
1 global rating
Top reviews
CMMGs low profile .750 gas block fits under standard free float handguards. Set screws engage the dimple on a properly dimpled barrel. Black phosphate finish. Aligns easily with the gas tube. Solid budget gas block.
