CMMG
Authorized Dealer • Boonville, Missouri • Aim To Be Different
Central Missouri Machine Gun — CMMG — is the Boonville, Missouri firearms manufacturer founded in 2002 by John and Jeff Overstreet and today one of the most innovative names in the American black-rifle market. The patented 22LR AR Conversion Kit, the Mk47 Mutant (AR-platform rifle in 7.62x39mm), the Banshee PDW line, the bufferless Dissent rifle, and ZEROED Suppressors are all CMMG engineering. Keep Shooting carries the CMMG lower parts kits and build accessories — AR-15 Gun Builders Kit, full AR-15 Lower Parts Kit, 308 Premium Lower Parts Kit, AR-15 Survival Kit, and Mk57 magazine extension hardware.
About CMMG at Keep Shooting
Keep Shooting is an authorized CMMG dealer carrying five pieces from the CMMG catalog, focused on AR-15 and AR-10 build components: the CMMG AR15 Gun Builders Lower Parts Kit ($45.45), the full CMMG AR-15 Lower Parts Kit ($82.07), the CMMG 308 Premium Lower Parts Kit ($96.49) for AR-10 / .308 platform builds, the CMMG AR-15 Survival Kit ($66.87), and an FN 57 Magazine 10rd Extension Kit ($18.85) compatible with CMMG's Mk57 platform. CMMG is the Boonville, Missouri firearms manufacturer whose "Aim To Be Different" tagline is backed by a genuine 20-plus- year record of patented engineering innovations in the AR platform — the 22LR conversion kit that defined the training-caliber category, the Mk47 Mutant hybrid AR/AK rifle, the Banshee PDW, and the bufferless Dissent compact action.
CMMG — officially Central Missouri Machine Gun — was founded in 2002 by brothers John and Jeff Overstreet in Fayette, Missouri, later relocating to Boonville, Missouri where the company's factory and headquarters remain today. Boonville is a small town of 8,000 on the Missouri River about an hour west of Columbia, in the agricultural corridor of central Missouri — not a traditional firearms- manufacturing hub like Connecticut's Winchester- Colt valley or Massachusetts' Smith & Wesson corridor, but a location that gave CMMG access to Midwest engineering talent, low real-estate costs, and a political climate supportive of firearms manufacturing. The company started as a small custom AR-15 builder and grew through the 2000s and 2010s into one of the most recognizable names in the modern black-rifle market, with a catalog that now spans complete rifles, pistols, and SBRs in 18 different calibers across the AR-15 and AR-10 platforms, plus conversion kits, lower parts kits, upper receiver groups, barrels, suppressors, and accessories.
The single most important product in CMMG's history is the 22LR AR Conversion Kit, which CMMG patented and released in 2010. The kit replaces the bolt carrier group and installs a 22LR-specific magazine in a standard 5.56mm AR-15, allowing the rifle to shoot 22 Long Rifle ammunition without any permanent modification to the host firearm. The practical value is substantial: 22LR ammunition costs roughly a tenth of what 5.56/223 costs per round, which means recreational shooters and competitive trainers can run hundreds of rounds through their AR for the price of a single box of 5.56. Professional trainers, police departments, and civilian shooters all adopted the CMMG conversion kit in volume through the 2010s; it remains the reference standard in the rimfire-AR conversion category. CMMG currently produces the 22LR Bravo Conversion Kit as the flagship of this product line — the kit's user-replaceable buffer, included 25-round magazines, and cleaning-tool integration represent 15 years of engineering refinement on the original patent.
In 2014, CMMG introduced the Mk47 Mutant — arguably the most innovative hybrid rifle in the modern AR market. The Mutant is an AR-15/AR-10 form-factor rifle chambered in 7.62x39mm (the AK-47 cartridge), using a proprietary POWERBOLT bolt carrier group sized between standard AR-15 and AR-10 BCGs to handle the larger-diameter 7.62x39 case without the full weight penalty of a .308 platform. The Mutant feeds from standard AK-47 magazines — the most widely available combat rifle magazine in the world, with billions of units produced since the original 1947 Kalashnikov — which means Mutant owners have access to 30-round steel and polymer mags at commodity pricing while retaining the ergonomics, optic- mounting flexibility, and trigger quality of the AR platform. For AK-47 magazine context see our AK-47 Magazines category.
The Banshee series is CMMG's modern personal-defense-weapon (PDW) platform — compact AR-pattern pistols and short-barreled rifles chambered in a range of pistol-caliber cartridges (9mm, 10mm, .45 ACP, .40 S&W) using CMMG's radial delayed blowback action that softens recoil dramatically compared to the direct-blowback designs that dominate the pistol-caliber carbine market. The Banshee is CMMG's response to the resurgent PDW category driven by MP5-style and Sig MPX competitors; the AR-platform commonality and the radial- delayed-blowback action are CMMG's differentiators. Resolute is CMMG's mid-length carbine platform — the mainstream 16-inch AR-15 and AR-10 lineup across multiple calibers. Endeavor is the long-range platform — heavy-contour-barreled precision rifles in .308, 6.5 Creedmoor, 6mm ARC, and other distance-focused calibers. Dissent is the 2023 bufferless-action rifle — the first CMMG design built around a patented Compact Action that eliminates the buffer tube and receiver extension, enabling true folding-stock configurations impossible on a standard AR platform.
The Mk57 is CMMG's AR-platform rifle chambered in the FN 5.7x28mm cartridge — the high-velocity small-caliber round designed by FN Herstal in the 1990s for the P90 PDW and the Five-seveN pistol. The 5.7x28mm is an unusual cartridge: the bottleneck case produces a 2,000+ fps muzzle velocity from a short barrel, with low recoil and armor-defeat capability against specific body-armor classes. The Mk57 brings the 5.7mm cartridge to the AR platform with a straight AR-15-compatible lower and a proprietary upper receiver matched to 5.7mm pressures. The FN 57 Magazine 10rd Extension Kit ($18.85) in our catalog extends Mk57 magazine capacity from standard to +10 rounds — a simple baseplate- replacement component that's useful for competitive shooters and range enthusiasts who don't want to pause to reload. The Mk57 is also compatible with standard FN 5.7x28mm magazines from the Five-seveN pistol family.
ZEROED Suppressors is CMMG's sound-suppressor line — full-auto rated, 5.56 and .308 calibers covered, with standard 1.375x24 direct-thread mounting and integration with CMMG's other product lines. Suppressors are NFA-regulated items requiring a $200 ATF tax stamp and 4-6 month processing time; CMMG's suppressors sit in the same regulatory category as other purpose-built cans. Keep Shooting does not currently stock ZEROED Suppressors (NFA items require specialized FFL-SOT dealer processing) — for the NFA product category generally see our NFA catalog.
The CMMG pieces Keep Shooting actually carries are lower parts kits and build accessories — the foundational components that go into any AR-15 or AR-10 build from stripped-lower-receiver start. The AR15 Gun Builders Lower Parts Kit ($45.45) is the entry-level LPK covering the springs, pins, detents, trigger-group small parts, bolt catch, magazine catch, safety selector, and pistol-grip hardware — everything the stripped lower receiver needs to accept an upper receiver group other than the trigger components and buffer tube assembly. The full AR-15 Lower Parts Kit ($82.07) is the complete version — same small-parts inventory plus the mil-spec trigger group, hammer, disconnector, and trigger springs, giving the builder a complete stripped-lower-to-functioning-lower conversion kit. The 308 Premium Lower Parts Kit ($96.49) is the AR-10 equivalent — same component philosophy sized for the larger .308 / 7.62 NATO receiver geometry. All three kits are built around CMMG's own- manufactured mil-spec-or-better components.
The AR-15 Survival Kit ($66.87) is CMMG's emergency-kit product — a parts bag containing the most common wear-and-break components for an AR-15 under field conditions: firing pin, extractor, extractor spring, buffer retainer and spring, ejector, and other small-parts items that every serious AR owner should have on hand but most don't. The kit is designed to ship in a pack or range bag so a shooter can replace a broken extractor at the range instead of discovering the rifle is down mid-match. Currently marked out of stock at this writing; check product page for current availability. For the broader AR-parts category see our AR Parts catalog, and for magazines see our AR-15 Magazines category.
Why buy CMMG over generic import parts? Three reasons. First, mil-spec or better tolerances — CMMG's lower parts are produced to the same specifications as the components installed in US military M4 service rifles, which means they interchange with any other mil-spec AR platform without fitment issues. Second, Lifetime Quality Guarantee — CMMG warranties every part against material and workmanship defects for the life of the product, which is an unusually strong coverage in a market where commodity import parts typically carry 30-90 day warranties. Third, American manufacturing at scale — CMMG's Boonville facility is one of the larger domestic AR-parts manufacturers still running at production volume, which matters for both supply-chain resilience and for buyers who specifically want to support US manufacturing rather than overseas contract factories.
CMMG products fit into the broader firearms-and-parts ecosystem on our site. See our Firearms catalog for complete rifles and pistols, our Gun Parts catalog for the full replacement-parts inventory, and our Magazines catalog for the 5.56/223, .308, 7.62x39, 9mm, and 5.7x28mm feeding hardware that pairs with CMMG's various caliber builds.
Keep Shooting ships all CMMG products from our Pennsylvania warehouse with free shipping on orders over $49.95 and hassle-free returns. Firearm parts ship in accordance with destination-state mail-order regulations; no FFL is required for CMMG lower parts kits, survival kits, or magazine extensions (these are non-serialized components). Whether you're an experienced AR-15 builder stocking lower-parts inventory for a build project, an AR-10 / .308 builder picking up the 308 Premium LPK, a range shooter stocking a survival kit for field repair capability, or a Mk57 owner extending magazine capacity, every CMMG product in our catalog is authentic factory inventory from the Boonville, Missouri line — backed by CMMG's lifetime warranty and the 20-plus-year record of innovation that has defined the company's place in the American black-rifle industry.
Frequently Asked Questions — CMMG
Yes, we maintain inventory of the most popular CMMG products. Each product listing shows real-time stock status. If an item is temporarily out of stock, you can sign up for back-in-stock notifications on the product page.
Yes! All orders over $49.95 qualify for free shipping, including CMMG products. Orders typically ship within 1–2 business days.
Keep Shooting offers hassle-free returns on CMMG products. If you're not completely satisfied, contact our customer service team for a return authorization. All products must be in original, unused condition.
Yes, Keep Shooting is an authorized CMMG dealer. All products are sourced directly and include full manufacturer warranty coverage.