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CMMG
Overview
The CMMG AR-15 MK 9 Lower Receiver Sub-Assembly is a complete lower designed specifically for the AR-9 platform, allowing you to build a reliable 9mm carbine. With its radial delayed blowback system, this lower receiver effectively manages recoil and enhances cycling, making it a solid choice for builders looking to create a smooth-shooting 9mm firearm. This component is often found in builds that prioritize blowback gas systems and 9mm caliber configurations, catering to those who appreciate the benefits of a more compact and versatile platform.
Specifications
CMMG AR-15 MK 9 Lower Receiver Sub-Assembly Radial Delayed Blowback
Build history on GunPartPicker
Builders have been adding the CMMG AR-15 MK 9 Lower Receiver Sub-Assembly Radial Delayed Blowback to their builds on GunPartPicker since February 2026. All time, it ranks #382 of the 1,049 lower receivers builders have added. Builds with this lower receiver are mostly chambered in 9mm (75%, then .40 S&W 13%), mostly on blowback gas (75%, then carbine-length 25%), and nearly all AR-9.
It was out of stock everywhere we track for all of September 2026, and today none of the 2 retailers we track has it in stock right now. Listed prices start at $149.33 at BattleHawk Armory for when it comes back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 30+ retailers
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Frequently Built With
The part most often added in each category by the builds that include this one
ALG Defense Qms AR-15 Trigger Set
Spike's Tactical Flat Top Upper w/ Ejection Port Door, 9MM, Black - SFT902D
Magpul AR-15 MOE Stock Collapsible Mil-Spec Black
LWRC International AR-15 Flip-Up Skirmish BUIS Sight Set Black
CMMG Barrel Sub-assm 5 Mt 4140CM SBN 40 S&w Only Compatible With Rdb BCG
Magpul AFG-2 Angled Fore Grip - Black
Build Configuration Breakdown
Aggregated and anonymized data showing how builders use this product
CaliberBased on real build data showing which calibers builders choose alongside this product.
Gas SystemBased on real build data showing which gas system lengths builders use with this product.
Builds Featuring This Part
See all 1 →Builds in the community that include the Cmmg Ar-15 Mk 9 Lower Receiver Sub-Assembly Radial Delayed Blowback
| Build | Parts | Total |
|---|---|---|
 | 11 | $1386.74 |
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