Discuss 9mm AR carbine as a go to

[MountainRaven]

Coming from someone who wants a 9mm carbine or 9mm AR pistol for a "truck gun/range toy" I don't see the advantages over a .223.
I see the initial build cost advantage going to the standard AR pattern in .223 for me. (mags and plenty of spare parts around here somewhere)
Ballistically and lethality gives a strong edge to .223.
Ammo cost at $.20 per 9mm and $.30 per .223 is $100 per thousand rounds. Personally 1000 rounds a year through this setup is something I probably won't do regularly so the savings becomes a moot point.

Try shooting them in the dark, in your house, without ear pro.

IMHO... you could easily use a 9mm Carbine as a goto firearm... but remember, the 9mm, even out of a 16" barrel still has the trajectory ( basically ) of a 22LR round.

So right around 100yds is ( give or take 30yds ) it starts to drop fast... that is a limitation to me.

Muzzle blast from a 16" is so little that the Lantac brake made no noticeable difference in my 9mm carbine. Not enough gas to utilize it... again in a 16" barrel..( very curious if shorter barrels actually work better with that brake )

Also, some 9mm AR's can be fussy with SD ammo... like the wide HP on a HST 147gr.

I ended up polishing the feed ramps to get reliable HP feeding.

And as for more velocity from the longer barrel.... not really... just not enough slow powder in a 9mm to boost its speed much over a 5"ish barrel.

You get some... but not like a .357 Magnum does out of a 16" barrel.

http://www.ballisticsbytheinch.com/9luger.html

The 147gr hold their speed best, ( at 100yds ) and also show the least added velocity from a 16" barrel.

In a world where people will make the argument for handguns as a go-to home defense gun, in a world where people will make the argument for pump action shotguns as a go-to home defense gun, the PCC or pseudo-subgun is absolutely a viable go-to gun.

And as Yoni has stated, it has capabilities that a rifle-caliber, full-size carbine or rifle doesn't have: The pseudo-subgun in your briefcase is better than the carbine you left at home or in your car.

[AlphaTango23]

Great video!


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[Screwball]

For a 9mm rifle, an AR does work well... however, there are other options. Are they better? Depends on what you are looking for.

Personally, my only issue going 9mm would be if you were planning on suppressing it... well, that and weight/finickiness of a blowback system. I was looking at building a pistol caliber AR for a ex of mine, who had a stroke a few years prior... and had terrible dexterity with her weak (left) side. The weight is noticeable, but you also need to figure out a buffer weight for the round you are shooting. Can it work with most of the spectrum of 9mm loads? Probably... but odd loadings might be an issue with function (at least how it was explained to me).

You can do D/I AR in pistol calibers... just not 9mm. The gas port is would be so close to the chamber that the jacket will break up and debris will make its way into the bolt group. I went with a .45, built by Macon Armory.











I got this carbine down to under seven pounds. Used Macon Armory's H&K USC magazine adapter currently, main due to current NJ law. Might be moving in the next year or so, so I'll pick up some of Macon's new magazines... which are 20 rounders, and fit in a standard AR magazine well. I have the adapter for them already.

[wct097]

Nice. I like the profile of that gun much more than the Glock lower 9mm setups.

This thread needs more PCC AR gun porn.

My contribution, a Colt pattern 4.5" 9mm:





And the stealth toolbox case I'm working on (waiting on foam), with my new SL-K stock:

[nate89]

I have built a few 9mm ARs, and currently have one. My primary purpose was cheaper ammoand safer to shoot at steel <50 yards, while still having more realistic recoil than a .22 LR (although still not the same).

I also reload, and not having to worry about trimming, swaging primer pockets, etc. and just loading 9mm is very appealing from both a time and cost perspective. I was skeptical about the .02/round cost, unless he bought components a LONG time ago. I still find it hard to believe. At current prices, I am loading 9mm for about 10-11 cents a round. That, for me, is a significant cost savings over .223.

I also have drills I like doing with steel, and having the ability to set them up as close as 7-10 yards is nice. I don't have any intention of using it as anything other than a range gun, but if I had to, I could load it up with 147 HSTs and put it to work. Yes a 5.56 will be much better at pretty much everything, but if needed it could be a useful self defense rifle.

[hk_shootr]

9mm caliber AR pistol is a great option that hasn't been discussed much.
Can be concealed, carried loaded and is very compact.

[AlphaTango23]

I have 3k rounds through my PSA Billet Glock Lower and Spinta Upper/ BCG. Using factory Glock mags I've had zero issues.


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[JusticeM4]

It would be a good option that I've tossed around for a while. Although For me it doesn't make sense as one of my CC weapons is a G19 (with 15/17/30rd mags), and HD weapon is a standard M4.

For fun and plinking, a 9mm AR pistol/carbine would be awesome if you have extra funds. Personally I plink with a 10" 22lr AR pistol with a KAK for much cheaper.

[wct097]

9mm caliber AR pistol is a great option that hasn't been discussed much.
Can be concealed, carried loaded and is very compact.

I struggle to comprehend how a 9mm caliber AR pistol can be concealed and is very compact. Don't get me wrong, I love my 9mm SBR, but I just can't figure why I'd want to carry an AR pistol over say a Glock 17 with a 33 round mag.

[hk_shootr]

I struggle to comprehend how a 9mm caliber AR pistol can be concealed and is very compact. Don't get me wrong, I love my 9mm SBR, but I just can't figure why I'd want to carry an AR pistol over say a Glock 17 with a 33 round mag.

Backpack, loaded on the truck seat under a jacket, loaded behind the seat........."concealed" does not always mean on your person, tucked in your pants.