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Building an AR-15 lower means chasing down a couple dozen tiny parts, and losing even one springy little detent can stall the whole project. CMMG's 55CA6C5 kit takes that headache off the table by giving you the full internal set in a single package. It drops into standard mil-spec AR-15 lower receivers, and every piece is machined to spec so parts fit the way they should without filing or fussing.
This is a complete kit, not a bag of mystery hardware. You get the trigger and hammer group with springs and retaining pins, the disconnector and its spring, safety selector with detent and spring, bolt catch assembly, magazine catch with spring and release button, pivot and takedown pins with their detents and springs, the buffer retainer and spring, and an A2-style pistol grip with the screw and washer. The mil-spec trigger runs a conventional single-stage pull in the 6 to 6.5 pound range, which is exactly what you'd expect from a service-rifle setup. Pair it with a stripped lower and a buttstock kit and your lower group is done.
The standout here is the packaging. Parts arrive sorted into color-coded bags grouped by assembly step, so you open one bag, install those pieces, and move to the next instead of digging through a pile. First-time builders lean on this kit for that exact reason, and there's a build video referenced right on the packaging if you want a visual guide. CMMG has been turning out lower parts kits long enough that their quality control sits a notch above the bargain-bin brands, and the fit stays consistent across different receiver makes.
Think of this as a rock-solid starting point. The mil-spec trigger and A2 grip get the rifle running and functioning right out of the gate, and plenty of builders shoot them as-is for years. If you decide down the road you want a lighter trigger or a grip with better ergonomics, both swap out easily, and you've got a proven platform to build from in the meantime.
It includes all of the internal components, the trigger guard, and an A2-style pistol grip needed to complete a standard AR-15 lower. You'll still need to add a stripped lower receiver and a buttstock or buffer tube assembly separately, since those aren't part of this kit. Once you pair those two items with this kit, your lower group is complete.
You get a standard mil-spec single-stage trigger with a conventional service-rifle pull in the 6 to 6.5 pound range. It's reliable and gets the rifle running right away, which makes it a solid choice for a first build or a range gun. If you want something lighter or crisper later, the trigger group swaps out easily for an aftermarket unit.
Yes, it's one of the more beginner-friendly kits out there. The parts arrive sorted into color-coded bags grouped by assembly step, so you install one section at a time instead of sorting through loose hardware. There's also a build video referenced on the packaging if you want to follow along visually.
It's built to fit standard mil-spec AR-15 lower receivers, so it drops into the vast majority of forged and billet lowers on the market. The one thing to watch for is older Colt AR lowers made from 1990 to 2009 that use large-diameter trigger pins, since this kit uses standard small pins. For a typical mil-spec receiver, everything fits without extra fitting or filing.
| UPC | 852005002080 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 55CA6C5 |
| Caliber/Gauge | AR-15 |
| Color | Black |
| Length | 10.9500 |
| Model | |
| Product Type | Lower Parts Kit |
| Safety | Lever Action |
| Shipping Weight | 0.6 |
| Units per Box | 1 |
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