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This kit hands you the recoil system and stock hardware to wrap up the lower group on a CMMG MK3 .308 rifle. Inside you get a CMMG A1 receiver extension, a .308 rifle buffer assembly, a .308 rifle action spring, and the A1 rifle-length buttstock. Everything is built to work together right out of the box, so you're not left guessing whether your buffer weight or spring length is right for a .308-pattern gun. Finished in a clean matte black, it mixes aluminum and polymer to keep things tough without adding unnecessary bulk.
The A1 is one of the most recognizable buttstocks in the AR world, and for good reason. A fixed rifle-length setup means no play, no rattle, and a consistent cheek weld every time you shoulder the gun. That solid connection pays off on a .308, where a stable platform helps you manage the extra recoil and hold your point of aim shot after shot. The A1 sits at a comfortable length of pull that most builders find natural, and CMMG's version uses modern high-strength polymer with a rear storage compartment and a sling mount built in.
This is where a purpose-built kit earns its keep. The .308 rifle buffer and action spring are sized to run inside the rifle-length receiver extension, which is critical on a larger-frame gun. Grabbing random parts off the shelf is how folks end up with a bolt that won't lock back or a stock that won't torque down right. Because these pieces are matched to the platform, you get reliable cycling and proper bolt travel from the start.
Think of this as the recoil-and-stock half of your lower. Pair it with your choice of lower parts kit and it completes the lower group on a CMMG MK3 .308. It's a straightforward job for anyone comfortable with AR assembly, and the fixed design keeps maintenance minimal down the road since there's nothing to adjust or work loose.
No, this kit is built for the .308 / MK3 platform and uses a .308 rifle buffer and spring. Those recoil components are sized for larger-frame guns and won't match up correctly with an AR-15 pattern rifle. If you're building an AR-15, you'll want a kit spec'd for that platform instead.
This kit covers the recoil system and stock: the A1 receiver extension, the .308 buffer, the action spring, and the A1 buttstock. To complete the full lower group you'll still need a lower parts kit for the fire control components, grip, and pins. Pair the two and your lower is good to go.
A fixed A1 gives you a rock-solid, wobble-free platform and the same cheek weld every single time you mount the rifle. That consistency helps with accuracy and recoil control, which matters even more on a .308. It's also lower maintenance since there are no adjustment points to work loose over time.
The kit ships with a .308 rifle buffer assembly and a matching .308 rifle action spring, both sized for the rifle-length receiver extension. Because they're matched to the platform, you get proper bolt travel and reliable cycling without having to source and test parts on your own.
| UPC | 815835016573 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 38CA964 |
| Color | RECEIVER EXTENSION/STOCK |
| Length | 16.7000 |
| Shipping Weight | 1.456 |
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