Click to see full view
Plan where it ships
Firearms ship to a dealer (FFL), not your door. Pick one now to see your full cost.
CMMG
Overview
The CMMG MK9 Stripped Lower is designed specifically for 9mm builds on the AR-9 platform, allowing you to create a custom firearm tailored to your preferences. This lower features a Colt pattern magwell, ensuring compatibility with Colt-style magazines, which provides reliable feeding and performance in your build. You'll often find this lower used in compact and tactical builds that prioritize maneuverability and versatility.
Specifications
September 2026 on GunPartPicker
CMMG MK9 Stripped Lower 9mm with Colt Pattern Magwell ranked #76 of the 477 lower receivers builders added on GunPartPicker in September 2026. Builders have been adding it to their builds on GunPartPicker since April 2026. All time, it ranks #125 of the 1,036 lower receivers builders have added. Builds with this lower receiver are mostly chambered in 9mm (89%, then 5.56 NATO 11%), mostly on blowback gas (80%, then mid-length 20%), and nearly all AR-9.
It was in stock most days in September 2026, and today only CMMG has it in stock. The best price drifted down from $174.95 to $155.78 over September 2026 without a real sale. Buying today, the lowest price is $174.95 at CMMG, above September's low of $155.78, so a better deal may come back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers
Not sure which lower receiver to pick?
We ranked every lower receiver by how often it shows up in real builds on GunPartPicker.
Read the guide: AR-15 Lower Receiver Trends →Check it against the live catalog:
Frequently Built With
The part most often added in each category by the builds that include this one
Tacfire 10" Complete Upper Assembly 9mm 1:10, Black - BU-9MM-10
Rise Armament Super Sporting AR15/10 Single Stage Trigger - Flat - Dtom Special Edition
Wilson Combat AR-15 Starburst Gunfighter Pistol Grip Black
CMMG AR15 Ambidextrous Safety Selector
Strike Industries Ambidextrous Magazine Release, Black - ARAMBIMRBK
Strike Industries Extended Bolt Catch
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.
No reviews yet. Be the first to review this product!