Flint River Armory CSA45 Carbine

Flint River Armory is a firearms manufacturer located in Huntsville, Alabama. They’ve released their first product – CSA45 (Carbine Semi-Automatic) carbine. It is designed from ground up to be a dedicated pistol caliber carbine chambered in .45ACP. It is a gas operated gun with a short stroke gas piston.

Flint River Armory - 1

CSA45 features machined receivers from billet 6061 T6 aluminum. It comes either as a rifle with 16″ barrel or as an SBR with 10″ one, and both barrels have threaded muzzles. The forearm of the gun is available with KeyMod or M-Lok accessory attachment options. The lower receiver is monolithic with the buffer compartment, which is meant to make it a stronger design. The gun also has a telescoping buttstock made of glass filled Nylon. CSA45’s upper receiver houses a reciprocating side charging handle on its left side.

Flint River Armory - 660x300

Another interesting feature of this carbine is that it uses standard AR-15 lower receiver parts. So the controls should be familiar to most of the customers. It will also allow the users to upgrade the carbine with one of countless aftermarket AR-15 triggers, as well as easily and cheaply replace broken trigger control group parts. CSA45 uses a proprietary stainless steel 25 round magazines. The gun also features a four lug rotating bolt.


Currently, CSA45 is chambered only in .45ACP, but Flint River Armory plans to offer the gun also in 9mm, .40S&W, 10mm Auto and .460 Rowland. The carbine works with wide variety of .45ACP cartridges. Here is a chart showing how it performs with ammunition from different manufacturers and with different loads/bullet weights:

CSA45 - chart

The dimensions and weight of the gun are as follows:

(Standard) 16” barrel: 30.9”
(SBR) 10” barrel: 24.9”

(Standard) 16” barrel: 6.56 lbs (empty, no optic)
(SBR) 10” barrel: 6.0 lbs (empty, no optic)

CSA45 is available through the manufacturer’s website at MSRP of $1695.

Here is a video from their YouTube channel as well as one from GunBlast.com :



Website: www.FlintRiverArmory.com
Address: 706 Rison Ave, Huntsville, AL 35801
Phone: 855-45-DFENS (855-453-3367)
E-mail: info@flintriverarmory.com

Hrachya H

Being a lifelong firearms enthusiast, Hrachya always enjoys studying design, technology and history of guns and ammunition. His knowledge of Russian allows him to translate and make Russian/Soviet/Combloc small arms related information available for the English speaking audience.
Should you need to contact him, feel free to shoot him a message at TFBHrachyaH@gmail.com


  • CSA? Really? Cause that doesn’t have hidden connotations. Anyway, was interested in but not for proprietary mags. Unless they have a good reason.

    • datimes

      I’m with you on the magazines. Why not MAC or some of the others out there and readily available?

      • Big Daddy

        Feed problems, you’re designing the gun around a magazine. It’s best with a new design to design your gun to work and design a magazine to work with it. Yes it increases price for the consumer but insures reliability. I have some experience with the M3 Grease gun and the mags are hard to load, the mag lips get bent and they are heavy. This is the type of gun that you won’t need more than 5-6 mags with anyway. 3-4 full capacity, a less cap for the range and very low cap for bench testing. Although i prefer to have 10 mags for each gun I own it takes some time financially to acquire them.

        • datimes

          Somebody should have told that to Wilson before he manufactured 3 new 9mm carbines.

          • Big Daddy

            Do you own any? Have you shot any? I just got a 9mm QC10 glock lower and upper for an AR15 pistol. Went to the range today and the bolt hold open doesn’t work it needs to be adjusted. I also had a bunch of Colt pattern AR15 9mm pistols, all had the same magazine related issue so I sold them. I speak from experience, I have built some 9mm AR pistols. Everyone has some type of hangup because the gun was designed around the magazine. Or as with the Colt 9m AR it was designed around a DI gun and uses blowback and Uzi type magazines, 2 drawbacks. So before you make a statement I suggest you do some hands on work with these guns. Go buy some Wilson 9mm AR15s at about $2000 each and come back and report about it. I am curious about them….

          • datimes

            Yes, I have the SBR and I’m extremely pleased with the gun. Fit and finish is superb. A few hiccups in the first 100 rounds and now performs reliably. If I was still working the street I would keep it in my cruiser. LEO and those retired get a $200 discount and the weapon is built to order..

          • Big Daddy

            Which magazine?

          • datimes

            When they were taking my order I barely got the G out of my mouth and the tech said Glock. I asked if this was the one in demand and he advised it was overwhelmingly the choice of customers. You are correct that the Wilson is a pricey weapon but only a few hundred bucks more than the Flint River. I’m at a point in my life I admire fine craftsmanship and will pay more for it and have less in my collection.

          • Big Daddy

            I think using a proven quality handgun magazine was a smarter idea than a flimsy cheaper problematic one. I will say I don’t think the straight blowback design will work that with with higher pressure round like a 357 sig or 10mm, even 40cal. The buffer would have to be really heavy. I’m using a KAW valley buffer and Sprinco heavy spring. With regular 9mm ammo it’s soft and isn’t loud, with the +p and Underwood +P+ ammo it was louder and had much more recoil and flip. I’m using an 8″ barrel, I might go with a LANTAC dragon. They are using a piston on this this 45 carbine and that’s much better than blowback. Having some experience with a M3 grease gun it was 45ACP and the bolt was very heavy as well as 2 springs on rails. I’d prefer it with DI or piston for anything bigger than a 9mm. If I had a machine shop I would be making some carbines and SBR/Pistols similar to this using more standard receivers and parts. QC10 is coming out with a lower that takes MP5 mags, a good idea, they are proven high quality sub mags. The bolt hold open on my ar/Glock pistol is working now, I’ll go to the range friday and check it out more. I hope this isn’t going to be one of those on and off things!!!

          • datimes

            My SOT really likes the QC10. Good luck on range day.

    • Ambassador Vader

      Second. Proprietary mags are a royal pain.

      • Montauk Trail

        I’ve spoken, in person, to FRA about the proprietary magazine situation. Their response was that they wanted double stack/single feed for reliability sake. Thompson and/or M3 Grease Gun magazines do not fit the bill. They are working with a magazine maker in either Massachusetts or Connecticut that makes magazines for some of the big boys of the industry. I too have handled and fired one of these carbines at a local indoor range and can say that the magazines are very well made.

    • iksnilol

      What’s CSA’s problem?

      • Edeco

        They were defeated in the Civ… *snrk* the War Between… *pthb* the Late Unpleas…

        …War of Northern Aggression!

        • Dougscamo

          DAAMMMNNN! I’m from the South and I didn’t even think about that! Guess some people are looking for hidden meanings more than others….

          • iksnilol

            You were too busy looking for your runaway “volunteer” workers to look for hidden meanings, right?

            Seriously, you practically gave that one to me 😛

            But in all seriousness, I agree with you. I never associated CSA with the confederales.

          • Dougscamo

            ooooooo…..that was cold…..never was super interested in the Civil War….know how it ends….

          • iksnilol

            I mean, it just reeks of simplistic and lazy writing. It’s not a storyline I’d recommend to be honest. Like, you’re not missing much.

          • Dougscamo

            Lost me…..Civil War literature….the post on the CSA…..?

          • iksnilol

            Civil War, the film was not that good and had no historical basis… which funny enough was a good tihng since the original historical story is… again, lazy writing and simple.

          • Dougscamo

            Ken Burn’s The Civil War?…(BTW, the background music in the second video was the same as Burn’s documentary)….you need to read The Killer Angels by Michael Shaara….aka Gettysburg in film form (that I wouldn’t recommend)….features the Forrest Gump of the Civil War….Joshua Chamberlain (Medal of Honor recipient) in that if something important was going on….he was there….good read about the last CW veteran to die of wounds received on the battlefield….50 years later….definitely not lazy writing….

          • iksnilol

            I was thinking about Captain America, but also the war of northern aggresion itself isn’t that interesting to me.

          • Dougscamo

            Do yourself a favor and check Wiki on Chamberlain….if you admire bravery and ideals….

          • RocketScientist

            From a weapons/warfare point of view its actually pretty interesting. They were fighting using the weapons of the next generation of war (reasonably accurate rifles, even some repeaters, etc) using mainly tactics of the previous generation. Lead to some horrendous casualties and the development of some new tactics that were ahead of their time (trench warfare, for one). Odd mix of the old and the new, all topped off by some of the most brilliant military commanders in a century (and some of the worst). The whole war is a study in contradictions.

          • Edeco

            Yankee-president Lincoln’s army ran off our serving-folk and molested our cows due to petty jealousy of the southern way of life.

      • RocketScientist

        Sine you’re furrin and might not get the references below: in the 1860s the US underwent an armed conflict where the southern states attempted to secede and form their own nation. It is usually referred to as the US Civil War, though it has other names, such as the War Between The States, or to many in the south the 2nd American Revolution, the War of Southern Independence, The War of Northern Agression, etc. The Southern states that seceded declared themselves the Confederate States of America (CSA). Since this company is based in Hunstville Alabama (which was one of the states to secede), people are speculating that calling the gun the CSA45 is a reference to their southern origins, with the name Carbine, Semi-Automatic just adopted as a “cover”.

        • iksnilol


          Completely flew over my head until now.

          • Dougscamo

            To quote you from a comment you made some time ago…..”You been schooled, Homeboy”…. 😛

          • iksnilol

            So it indeed seems to be the case.

        • Dougscamo

          “Sometimes a cigar is just a cigar”…..

        • Seth Hill

          Years ago I had thought about starting a manufacturing business and call it Confederate States Armory. That was well before The Great Uniter became El Presidente

    • Cyrus

      I’m actually interested to see how the magazines turn out. I’m not all that happy with some of the .45 hicaps out there, really the only ones I like are for Glocks.

  • This looks enormously cool, but it also kindasorta looks like the reciprocating charging handle would rearrange your front teeth if you tried to fire it with a nose-to-charging-handle AR cheekweld.

    • Dougscamo

      Yep….but maybe they wanted righties to suffer for a change…..

      • Montauk Trail

        None of the three guys in the video had problems with the bolt handle and they were all three right handed.

  • CharlesH

    Why keymod….why!

    • Joe

      Because options. You can have it in MLOK or keymod.

  • ozzallos .

    Wow, they actually *found* some 78gr Liberty Civil Defense to test with? I’m more impressed by that than the product.

  • john huscio

    Need a 10mm

  • Raginzerker

    A gas operated pcc? Huh, interesting

  • SignalFromTheRim

    Can some translate the second video for me? Are they even speaking English?

    • Dougscamo

      They are if you are from Alabama and parts South….not that there is anything wrong with that….no dialects where you hail from?….They said they LIKE it…..

      • SignalFromTheRim

        No. It’s either English or Spanish in my neck of the woods.

        • Dougscamo

          LOL…..must be a short neck…..

    • Seth Hill

      Contrary to popular belief “mom’n’em” is not Eminem’s mom’s rapper name.

  • AndyHasky

    That M. Night Shyamalan twist at the end of the video where the guy is really the sheriff really blew my mind.

    10/10 would operate with

  • Kyle

    That will be pretty cool once they drop the .460 Rowland version. That cartridge has enough bang behind it to be pretty awesome in a carbine.

  • roguetechie

    That’s actually pretty cool, and looks to be designed to be a buy once cry once item.

  • nova3930

    Had no idea there was a manufacturer in town other than Remington….

  • lowell houser

    So, they built a semi automatic submachine gun and then left no way to attach a slidefire stock to it?

    • DIR911911 .

      darn , they must have wanted to hit the target

  • Raoul O’Shaugnessy

    “CSA45 uses a proprietary stainless steel 25 round magazines” and that’s when the potential sales walked off a cliff.

  • mig1nc

    This is shockingly… Not bad. WIN for American small business.

    I wonder how well it will suppress? I’ve ran the MCX (another gas-piston PCC) suppressed and wasn’t bothered, but obviously some folks don’t get along well with it.

  • George K. Reed

    Holy cow $1700. I gues this isn’t the .45 carbine I was looking for. Sigh.