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The Combat Armory Billet AR-15 Lower Receiver is a stripped lower for anyone building an AR from the ground up or swapping into something a little nicer than a plain forged blank. It starts as a solid block of 7075-T6 aluminum and gets CNC-machined to mil-spec dimensions, so it drops into a standard build without surprises while carrying the cleaner lines and contours that billet fans go for. The finish is a straightforward black, and the receiver comes bare so you get full say over the trigger, safety, grip, and buffer setup that goes into it.
Two details do most of the heavy lifting here. The trigger guard is machined right into the receiver in that Magpul-style shape, so there's no separate guard to pin in and no gap under the grip for your middle finger. The magwell is flared, which sounds like a small thing until you're running a reload under pressure and the mag just funnels in. Builders who have run these tend to point out the receiver feels a touch heftier and more solid than a lot of the budget lowers floating around, which is a fair trait of a billet cut versus a thin forging.
Because it's stripped, this is a blank canvas. You'll add a lower parts kit, a grip, a buffer tube assembly, and whatever fire control group suits your build, whether that's a mil-spec trigger for a range gun or a nicer drop-in for a precision setup. The mil-spec cut means most standard uppers mate up fine, though as with any billet lower it's smart to test fit your upper before you commit to final assembly. It's a popular starting point for 5.56, .223, and .300 Blackout builds, and it pairs especially clean with a matching billet upper if you want the whole rifle to have that squared-off, custom look.
Bottom line, if you like doing the wrench work yourself and want a receiver that looks sharp and machines true, this one earns its spot in the parts bin.
No, this is a stripped lower, so it ships as the bare receiver with nothing installed. You'll need a lower parts kit, a grip, and a buffer tube assembly to finish it out, along with a fire control group of your choosing. That's the appeal for a lot of builders since you get to pick every internal part yourself.
It's machined to mil-spec dimensions, so most standard AR-15 uppers will mate up fine. Billet lowers can sometimes run tighter or looser with certain uppers, so it's always worth a quick test fit before final assembly. If you want the tightest fit and matching looks, pairing it with a billet upper is the way to go.
A billet lower is CNC-machined from a solid block of aluminum, while a forged lower is pressed into shape and then finished. Billet receivers allow for extras like the integrated trigger guard and flared magwell you see here, and they tend to have a more custom, squared-off look. Both are plenty strong for normal use when made from 7075-T6.
Since it's a standard AR-15 lower, it works with any caliber that runs on the AR-15 platform and standard magazines. That includes popular options like 5.56 NATO, .223 Remington, and .300 Blackout. The caliber is ultimately determined by the upper and barrel you pair with it.
| UPC | 789091896630 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | STP.CA15.Lower.BLK |
| Shipping Weight | 0.86 |
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