New Frontier Armory is expected show its new C-45 lowers at the 2017 SHOT Show. These new lowers are said to be machined from a single block of 7075-T6 aluminum and will be available in both black anodized and unfinished (or raw.)
The C-45 is designed as an AR-15 lower that uses Glock .45 ACP and 10mm magazines. This would allow a shooter to build a pistol caliber carbine around these mags while still using standard AR parts. Currently, the company offers a similar lower that uses standard 9mm, .357 SIG and .40 S&W Glock magazines.
Pistol caliber carbines have become quite popular. While 9mm seems to be the most popular, other calibers are gaining traction as well. I’ve often thought that a 10mm or .357 SIG carbine could prove very interesting out of a carbine, especially with lighter bullet weights.
Most pistol caliber AR carbines are fed from either Colt style stick magazines or from Glock pistol magazines (there are a few exceptions). While the Colt style guns have been around for about 30 years, Glock magazine fed rifles are much newer. Nevertheless, the guns built around the Glock magazines have become quite popular, and many companies are now offering or are developing guns that use them.
I look forward to seeing the new C-45 lowers. I also hope that the company offers an 80% version of the lower.