Flint River Armory Introduces .45 ACP Carbine

posted on October 28, 2016

Looking for a new pig gun? Flint River Armory of Huntsville, Ala, introduces the world’s first .45 ACP carbine that actually works: the CSA45. That’s because it’s the first .45 ACP carbine to feature a rotating/locking four-lug bolt and a 9mm short-stroke gas piston—designed from scratch.

The upper receiver is built from billet 6061 T-6 aluminum; the monolithic lower encompasses the buffer compartment; diagonal placement of the takedown and pivot pins provide structural strength. This may look like an AR—but it’s not! In fact, the only AR parts used on the CSA45 are an AR lower and a mil-spec fire-control system. The rest of the gun was designed from scratch by the folks at Flint River Armory, a company founded by a retired Navy aviator and staffed solely by engineers. The CSA45 is available as a carbine with a 16-inch barrel; as a short-barreled rifle with a 10-inch barrel; and as a pistol. Overall length of the carbine is 30 inches, and it weighs 6.7 pounds; SBR overall length is 24.9 inches, and it weighs 6 pounds; the pistol measures 24.5 inches and weighs 5.7 pounds.

Company staff tell us there is about as much design R&D put into the firearm’s proprietary, stainless steel, 25-round magazine as the rest of the gun, because it was a chore to design a double-stack, single-feed system that actually worked to feed .45 ACP cartridges. Flint River Armory tells us customers are reporting 1-inch groups at 50 yards from a bench. At least one load tested by the company includes Hornady Critical Defense (200-grain XTP bullet, 900 fps from the carbine).Color options are endless thanks to customer-chosen Cerakote finishes.


2022 GBA AOTY Winchester 6.8 Western Lead
2022 GBA AOTY Winchester 6.8 Western Lead

2022 Ammo of the Year: Winchester 6.8 Western

Any way you cut it, this cartridge is a long-range winner. It maintains its energy at distance, and it’s plenty accurate, too.

Pioneering Wild Turkey Research Underway

The National Wild Turkey Federation (NWTF) is helping fund a new wild-turkey research project conducted by Mississippi State University and the Mississippi Department of Wildlife, Fisheries and Parks.

2022 Optic of the Year: ATN ThOR 4 Thermal Riflescope

ATN Corp. sits at the cutting edge of consumer-based thermal technology, and its ThOR 4 Series 640x480 2.5-25x50mm is the best such riflescope it offers.

Federal Ammunition Raises $218,000 for Local Organizations

In celebration of Federal’s 100th Anniversary, Federal will be donating more than $218,000 dollars to local organizations in support of their critical missions.

Federal Duck Stamps for 2022-23 Season on Sale

The 2022-23 Federal Duck Stamp goes on sale Friday, June 24. The stamps, which cost $25 and raise about $40 million for conservation each year, are valid from July 1, 2022, through June 30, 2023.

2022 Muzzleloader of the Year: CVA Paramount HTR .40-Caliber

With its hunting-style stock, adjustable comb and premium Bergara barrel, the .40-caliber CVA Paramount HTR is capable of producing centerfire velocities previously thought unattainable from a muzzleloader.


Get the best of American Hunter delivered to your inbox.