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Running a .22 LR conversion kit in your AR is one of the cheapest, most fun ways to keep trigger time up, and the right magazine makes all the difference. The CMMG Mk4 / AR-15 .22 LR 10-round conversion magazine takes the guts of CMMG's well-regarded 22ARC design and wraps them in a durable polymer shell finished in Flat Dark Earth, so it looks right at home in a matched build. It drops into CMMG Mk4 and standard mil-spec AR-15 lower receivers and feeds your converted .22 LR upper without any fuss.
The internal geometry is the same setup CMMG has been refining for years, which is why these mags have a reputation for smooth, reliable feeding once broken in. The polymer body shrugs off drops, range grit, and the general abuse that comes with a working plinker, and the floor plate holds up to being dropped on concrete all afternoon. If you already run CMMG mags or a CMMG conversion kit, this one keeps everything looking and functioning like a set.
A couple of field-tested tips: .22 LR rounds vary in rim and bullet profile, so copper-plated ammo tends to feed cleanest, and CMMG themselves recommend plated rounds for best results. New mags load a little stiff toward the top, which is normal for rimfire, and they loosen up after some use. A quick wipe-down and keeping your conversion bolt lightly lubed goes a long way toward keeping cycling snappy, since rimfire ammo runs dirty by nature.
At 10 rounds, this magazine keeps the handling familiar and the loading manageable compared to the larger 25-rounders, making it a great pick for zeroing optics, teaching new shooters, or just burning through a brick of .22 on a Saturday. It ships in Flat Dark Earth to complement tan and FDE builds, though the function is identical to the black version.
No, the magazine is only part of the equation. You'll need a .22 LR conversion kit or dedicated .22 LR upper installed for your rifle to fire rimfire. Once your conversion is in place, this mag feeds the rounds into it and drops right into a Mk4 or mil-spec AR-15 lower.
Copper-plated .22 LR tends to feed the cleanest, and CMMG specifically recommends plated ammo for best results. Brands like CCI, Federal, and Aguila have a strong track record in these conversions. Waxy or bulk-pack ammo can run dirtier and may not cycle as consistently.
That's normal for rimfire magazines and nothing to worry about. New mags feel stiff toward the top few rounds until the spring breaks in. CMMG even suggests underloading new magazines at first, and after some range use they loosen up and load much easier.
Not at all. The Flat Dark Earth and black versions share the same proven 22ARC internal design and feed identically. The only difference is the exterior color, which is there to match tan and FDE builds.
| UPC | 840442507565 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 22AFC77-FDE |
| Caliber/Gauge | .22 LR |
| Capacity | 10 |
| Color | Flat Dark Earth |
| Product Type | Magazine |
| Shipping Weight | 0.424 |
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