NOTE: Stripped lowers are considered the firearm, so this must be delivered to an FFL-holder. It is fairly easy to complete the lower with readily available parts and the trigger group of your choice.

Bushmaster Stripped Lower Receiver Product Description
Receiver is a rigid 7075 T6 aluminum forging with extra metal in the right places for added strength without unnecessary bulk. Features a beefy, M16A2-pattern reinforced area around the front pivot pin, a strengthening ridge over the receiver extension threads, and a ridge around the mag release button to guard against accidental magazine drop by preventing unintentional button activation. Bead blasted after machining to ensure a uniform, non-reflective surface before application of lusterless black military hardcoat A8625, Type III, Class 2 anodized finish that adds surface strength and resists abrasion. A final, nickel acetate seal coat provides extra protection against corrosion. Stripped lower is the perfect companion for Bushmaster Lower Receiver Parts Kit, available separately

At SHOT 2009, Glen Seekins unveiled some cool, new products, including a new AR15 lower with many unique features. The Seekins SP223 lower features flutes on the magwell front face for improved grip, plus an enlarged triggerguard allowing use with gloves. The new lower takes standard milspec mags as well as MagPul P-Mags. It should be available in April 2009, with a price of about $350. Glen tells us that a Seekins AR upper design will follow “down the road.”

Seekins also announced new Remington 700 bottom metal. The Seekins R700 bottom metal assembly is made from 7075-T6 Aluminum allow — very tough stuff. The R700 is currently offered for .223 Rem, .308 (and other standard short action rounds), and .338 Lapua. A WSM version will be available soon. This bottom metal works with 5-round magazines, but Seekins will be offering 10-round .223 and .308 mags in the summer.