Talk to Me About the 9mm AR-15

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Short version: I've decided I want another rifle for my birthday/Christmas present this year (I'm turning 35). And I think I want a Colt AR-15 in 9mm.

Long version: I have an AR-15 in 5.56 but there have been changes at my local range, so it doesn't come out as much as it used to. There's no more rapid fire, no more steel plates on the rifle range, rifles are to be only fired into the specific 50, 100 or 200 yard backstops with paper targets, etc.

We do have a small steel-plate range at our family's camp, which a pistol caliber carbine is perfectly suitable for. The ranges are short (10-50 yards) and the guns that get the most use on it are the .22s and pistols. Now I want a center fire carbine that can be used on this range, and pretty much anywhere it's safe to shoot a larger-than-.22LR firearm.

The advantages I see to the 9mm AR are: it's a semi-auto firing a common, inexpensive round. It's the same lay-out as my 5.56 AR. It holds A LOT of rounds (32-round stick magazines), which makes for plenty of steel plate fun between reloads. I can throw a small red dot on it and it would make an excellent stand-in for shooting the 5.56. Plus I'm set-up to reload 9mm, so if the inexpensive factory ammo dries up, I'm still in good shape for feeding it.

Downsides: Expensive. It's the upper limit of my budget, and adding magazines and a quality RDS are going to take some time. I'm unsure if reloading 9mm for a blowback carbine is going to have different requirements than loading for a locked breech pistol. It's a semi-auto, so the brass is going to go EVERYWHERE while shooting. It's an AR-15, with all of the potential transport issues that entails (don't take it into MA or NY, don't travel into VT with high-capacity magazines these days, etc).

So talk to me about your experiences with 9mm AR-15s, or 9mm Pistol Caliber Carbines in general.

Keep in mind, I haven't ruled out a .357 Magnum lever action or a new .22 semi-auto rifle. (I really like the looks of the maple-stock Browning SA-22s and logic and reason could lose out to pure emotion.)
 
I can't fault your logic:

GVgRIG8.jpg

I've had my Colt AR6951 for a few years now and about shot about 2K through it. I use it as an AR trainer and in our local IDPA matches. Runs like a top. Only modifications I've made are the Magpul furniture, a Geisele SSA-E trigger (to match my other ARs) and the Mossie light mount.
 
Only one real caution to look for. I thought I really did my homework before building my 9mm but to my surprise most barrels have a short throat. I will have to do some barrel work, buy another barrel or load rounds specific for the rifle which defeats the whole purpose of the build to go with my pistol
 
Your reasoning for wanting a 9 mm AR15 mirrors my own. I built mine using New Frontier bits so that it can share magazines with my carry Glock, and it has been utterly flawless.
 
I use mine for exactly what you describe, steel plate plinking at 10-50 yards, sometimes 100. I LOVE mine.

C52028C1-8260-4ECB-8F8B-77937C88D3E1.jpg

I built mine from parts using a PSA colt style pistol lower, a BCA side charging upper, a 10” faxon barrel, and a Kak pistol brace. Everyone loves to shoot it. I shoot the same handloads as my pistol and it will cycle anything, but will occasionally fail to feed unless you use fmj rn bullets. Cost me $600 to build it.
 
I don’t enjoy mine at all. Way too heavy for the cartridge it shoots. It is my least favorite of my 9mm long guns. I would rather shoot my Ruger PCC or my Marlin Camp Carbine. In fact I would rather buy a Hi Point and spend the balance on ammo and spare mags.
 
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I don’t enjoy mine at all. Way too heavy for the cartridge it shoots. It is my least favorite of my 9mm long guns. I would rather shoot my Ruger PCC or my Marlin Camp Carbine. In fact I would rather buy a Hi Point and spend the balance on ammo and spare mags.

Funny....
IAW Manufacturers spec sheets:

Ruger PCC weight 6.8Lbs
Marlin Camp Carbine: 6.75lbs
Colt AR6951: 6.35 Lbs
 
Thanks all for the input so far. Some interesting points to think about. Especially regarding the possibility of having a short-throated chamber. Though I've run into that with 9mm in pistols in the past.

For the record, it will be a Colt if I go with a 9mm AR. My 5.56 AR is a Colt 6920 and I have a pair of Colt Government Models (one in .45 ACP, one in .38 Super). From what I've seen of the Marlin Camp Carbines, they do not hold up to heavy usage. I haven't really checked out the new Rugers yet, but I'm not a big Ruger fan in general. I've handled a couple of Just Right Carbines and frankly only felt "Meh."

I am considering the new Marlin 1894s as an option as well. Having a .357 revolver, a .38 revolver and a pile of brass, bullets and loaded ammo makes it a shoe-in. And I've held one of these in person and was quite impressed by it: https://www.marlinfirearms.com/lever-action/model-1894/model-1894-csbl

Edited: To echo rbernie's point, I dislike all of the heavy barrel, HBAR and other profile AR-15s out there. They're too nose heavy compared to even a government profile A2 barrel. And nothing like the old pencil barrel SP-1s and A1s.
 
. I'm unsure if reloading 9mm for a blowback carbine is going to have different requirements than loading for a locked breech pistol. It's a semi-auto, so the brass is going to go EVERYWHERE
Load the same. Brass doesn't go all that far and stays pretty much together. A 9MM AR is more fun than a barrel full of monkeys.
 

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I had a hi point 995 for about 4 months or so. At first I really liked it but after a time it’s quirks really wore on me and I got rid of it. They function but the are pretty much an exurcise in how to make the cheapest flimsiest gun possible. I sold it and built the AR pistol and couldn’t be happier with that choice. Solid gun and you can forever repair and reconfigure to suit your needs.
 
Another option are the magazine adapters which convert a regular AR mag to 9mm, meaning you can use a common lower.

I have the Sylvan Arms adapter that accepts Glock magazines. My experience is that it is just as reliable as the dedicated Glock mag lower.
 
The Colt is a high quality gun, but if this is just for fun and you want to budget for a red dot and other things take a look at Foxtrot Mike brand at Primary arms. They were running dyone sales on them and they seem to be pretty good quality. They also offer lrhb which is a nice feature. Multiple configurations available
 
Since I have a form 4'd AR, I got a 10" 9 mm upper. It is about as fun as it gets without spending the additional $20,000 to get full auto. Mine:
mceclip0.jpg

If you have a nice lower (trigger work, etc.) then I'd for sure get an upper, and a magwell adapter. Those are weird, many options; mine works perfectly but is a bit of a hack job.

If you get the upper alone, one weird thing is that the bolt on the Colt SMG (and Colt pattern carbines) is designed to have additional delay from the hammer, but that abuses your 5.56-shaped hammer and it will eventually break. You need the 9mm bolt cut for the 5.56 hammer. Some come that way, some people do the service mail order, many local gunsmiths can do it also.

Mags for colt pattern guns are easy. I have had no issues at all with the Colt-pattern ASC mags. Can get them pretty cheap as well.


You can get a little further from the strict AR15 pattern with the many, many pistol-mag-pattern carbines. Or pistols with braces if that is your way I suppose. The CMMG one for Glock mags:
CMMG-MkG-DRB-9.jpg
Especially good if you have lots of pistol mags for a compatible system, etc.


And then there's various slighhtly different 9 mm carbines. For suspiciously little money. The MCX is pricey, but the Scorpion Evo Whatever things are pretty nice, and pretty cheap, in a bunch of versions. This is rifle legal length, with a faux suppressor instead of just lots of barrel.
CZ-Scorpion-FAUX-Sup-FDE.png.jpg
 
I don’t enjoy mine at all. Way too heavy for the cartridge it shoots. It is my least favorite of my 9mm long guns. I would rather shoot my Ruger PCC or my Marlin Camp Carbine. In fact I would rather buy a Hi Point and spend the balance on ammo and spare mags.

The 9 mm AR-15 is a kludge job. I mean, just look at that skinny 9 mm magazine in that 5.56 magazine well! I would look for some sort of dedicated 9 mm carbine. Maybe a semi UZI.
I agree with the above posts. As a Ruger Carbine and Marlin Camp9 Carbine owner, I would not spend AR15 money,on a 9MM unless you are :
#1.Rich 2. Extremely in love with the AR15 design .3. Have a pile of magazines for anAR9mm already ? (they are rare & $$$,....if so see #1)
 
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I agree with the above posts. As a Ruger Carbine and Marlin Camp9 Carbine owner, I would not spend AR15 money,on a 9MM unless you are :
#1.Rich 2. Extremely in love with the AR15 design .3. Have a pile of magazines for anAR9mm already ? (they are rare & $$$,....if so see #1)

Colt pattern magazines are anything but rare, and at $23.99 per aren't exactly $$$$.

http://gregcotellc.com/cart/ar15-9mm-metalform-magazines-c-175/?zenid=b98nb0f9vp5g7scpv8b34a6ki4

The Metalform's I linked are the OEM manufacturer for Colt. You can also get them cheaper by keeping your eye out for PSA sales. I bought 10 last year for about $13 per. PSA Mags are also Metalforms.
 
Not the platform you are looking for but my cz scorpion pistol class is fun factor ten. Got a small vortex red dot and it rings steel all day. Hbi industries has some trigger springs if you want to lighten it up and 30 round mag's
 

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Funny....
IAW Manufacturers spec sheets:

Ruger PCC weight 6.8Lbs
Marlin Camp Carbine: 6.75lbs
Colt AR6951: 6.35 Lbs

All of these are too heavy for a 9mm carbine. The TNW is 5.5 lbs. ambi eject, uses Glock mags and only requires a barrel/bolt head exchange for a different cartridge.

I suppose if you have to have a 9mm AR then you should have one but there are more versatile options out there.



No stake in the fight, I don't own either one.
 
Colt pattern magazines are anything but rare, and at $23.99 per aren't exactly $$$$.

http://gregcotellc.com/cart/ar15-9mm-metalform-magazines-c-175/?zenid=b98nb0f9vp5g7scpv8b34a6ki4

The Metalform's I linked are the OEM manufacturer for Colt. You can also get them cheaper by keeping your eye out for PSA sales. I bought 10 last year for about $13 per. PSA Mags are also Metalforms.
You're right.
I guess it's just my state where they are rare because we have the awb still in effect and anything over 10 rounds must be pre ban and they are big $$$.

Just banned AR15 rifles last year.....wonder if a 9mm pistol caliber AR15 would still be legal?
 
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