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CMMG
The CMMG AR Mk 57 Conversion Kit in .22 LR is your ticket to affordable, high-volume plinking without retiring your 5.7x28mm upper receiver. If you own a CMMG Mk57 upper and want to run cheap .22 LR ammunition for practice and fun at the range, this drop-in conversion kit swaps the bolt-carrier group to instantly transform your rifle into a .22 LR shooter. It's a smart way to get the most out of a single upper receiver—no gunsmithing, no tools required.
The kit is built on simplicity: remove your existing Mk57 bolt-carrier group and drop in the .22 LR conversion unit. Attach your Mk57 upper to any mil-spec AR-15 lower receiver, load one of the three included 10-round magazines, and you're ready to shoot. Because .22 LR brass and ammunition are plentiful and inexpensive, you'll spend less per round and more time at the range honing your fundamentals or just enjoying a day of marksmanship without the recoil and noise of centerfire rounds.
The included magazines are compatible with all mil-spec AR-15 and Mk4 magazine wells, so they'll work with standard AR platforms. This kit is purpose-built for shooters who already have a Mk57 upper and want the flexibility to train affordably or introduce new shooters to the platform without breaking the bank on ammunition.
| Caliber | .22 LR |
| Type | Conversion Kit (Bolt-Carrier Group) |
| Fits | CMMG Mk57 Upper Receiver |
| Magazine Capacity | 10 rounds (per magazine) |
| Magazines Included | 3 |
| Magazine Compatibility | Mil-spec AR-15 and Mk4 magazine wells |
| Installation | Drop-in (no tools required) |
| Manufacturer | CMMG Inc. |
Yes. You'll use the CMMG Mk57 upper receiver with this conversion kit mounted on any mil-spec AR-15 lower receiver. The included magazines are compatible with standard mil-spec AR-15 magazine wells.
No. The kit is designed as a drop-in replacement. Simply remove your existing Mk57 bolt-carrier group and replace it with the .22 LR conversion unit. No tools required.
Yes. Because the conversion is a bolt-carrier group swap, you can switch back to 5.7x28mm by reinstalling your original Mk57 bolt-carrier group.
The kit includes three 10-round .22 LR magazines. These magazines are compatible with all mil-spec AR-15 and Mk4 magazine wells, making them versatile across standard AR platforms.
CMMG
The CMMG AR Mk 57 Conversion Kit in .22 LR is your ticket to affordable, high-volume plinking without retiring your 5.7x28mm upper receiver. If you own a CMMG Mk57 upper and want to run cheap .22 LR ammunition for practice and fun at the range, this drop-in conversion kit swaps the bolt-carrier group to instantly transform your rifle into a .22 LR shooter. It's a smart way to get the most out of a single upper receiver—no gunsmithing, no tools required.
The kit is built on simplicity: remove your existing Mk57 bolt-carrier group and drop in the .22 LR conversion unit. Attach your Mk57 upper to any mil-spec AR-15 lower receiver, load one of the three included 10-round magazines, and you're ready to shoot. Because .22 LR brass and ammunition are plentiful and inexpensive, you'll spend less per round and more time at the range honing your fundamentals or just enjoying a day of marksmanship without the recoil and noise of centerfire rounds.
The included magazines are compatible with all mil-spec AR-15 and Mk4 magazine wells, so they'll work with standard AR platforms. This kit is purpose-built for shooters who already have a Mk57 upper and want the flexibility to train affordably or introduce new shooters to the platform without breaking the bank on ammunition.
| Caliber | .22 LR |
| Type | Conversion Kit (Bolt-Carrier Group) |
| Fits | CMMG Mk57 Upper Receiver |
| Magazine Capacity | 10 rounds (per magazine) |
| Magazines Included | 3 |
| Magazine Compatibility | Mil-spec AR-15 and Mk4 magazine wells |
| Installation | Drop-in (no tools required) |
| Manufacturer | CMMG Inc. |
Yes. You'll use the CMMG Mk57 upper receiver with this conversion kit mounted on any mil-spec AR-15 lower receiver. The included magazines are compatible with standard mil-spec AR-15 magazine wells.
No. The kit is designed as a drop-in replacement. Simply remove your existing Mk57 bolt-carrier group and replace it with the .22 LR conversion unit. No tools required.
Yes. Because the conversion is a bolt-carrier group swap, you can switch back to 5.7x28mm by reinstalling your original Mk57 bolt-carrier group.
The kit includes three 10-round .22 LR magazines. These magazines are compatible with all mil-spec AR-15 and Mk4 magazine wells, making them versatile across standard AR platforms.
