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CMMG
Overview
The CMMG MK3 Semi-automatic Stripped Lower Receiver is designed specifically for the AR-10 platform and is compatible with .308 Winchester caliber components. This stripped lower allows builders the freedom to customize their setup from the ground up, ensuring that they can choose the specific parts that suit their needs and preferences. You'll often find this lower paired with a mid-length gas system in builds focused on .308 Win, making it an excellent choice for those looking to create a reliable and powerful firearm.
Specifications
CMMG MK3 Semi-automatic Stripped Lower Receiver 308 Winchester
Available Merchants(4)
Prices checked
Price Alert
September 2026 on GunPartPicker
CMMG MK3 Semi-automatic Stripped Lower Receiver 308 Winchester ranked #65 of the 477 lower receivers builders added on GunPartPicker in September 2026. Builders have been adding it to their builds on GunPartPicker since February 2026. All time, it ranks #144 of the 1,036 lower receivers builders have added. Builds with this lower receiver are mostly chambered in .308 Win (89%, then 6.5 Creedmoor 11%), mostly on rifle-length gas (70%, then mid-length 30%), and nearly all AR-10.
Availability is good: it was in stock at one retailer or another nearly every day in September 2026, and today 3 of the 4 retailers we track have it in stock. The best price drifted down from $224.34 to $214.99 over September 2026 without a real sale. Buying today, the lowest price is $237.54 at Classic Firearms, above September's low of $214.99, 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
CMMG MK3 .308 Stripped Upper Receiver w/o Forward Assist - Armor Black
Rise Armament RA-100F AR Trigger Two-Stage Flat S7 Tool Steel 4.5-lb Pull Fits AR-10/AR-15.
Magpul MOE K2 Grip Polymer Gray
Breek Arms AR-15 Warhammer MOD2 Ambidextrous Charging Handle Black
Cryptic Bolt Carrier Group BCG - Complete .308 WIN/7.62x51mm/6.5 Creedmoor Magnese Phosphate
Luth-AR MBA-1 Stock With Buffer Assembly, A2 Extension Tube .308 Buffer Spring, Black - MBA-1K308
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.
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