Ar 9mm

[unknown]

This is just my own ignorance, but why would anyone pick a 9mm AR over a 5.56?

[The Lance]

Cheaper rounds. Some 9mm lowers can be adapted to use glock mags or uzi mags..


Would be a great option for 3 gun.

[LumberZach]

Kind of like asking why anyone would buy a Taurus judge or a lot of other random deals. All personal preference, and different uses for the gun.

[AR-15collector]

A logical application for it would be someone who likes a carbine platform for home defense but doesn't want to shoot through walls and possibly have collateral damage. Ex. I live in a townhouse and and can only safely defend myself in two directions because I have neighbors on my east wall and on my south wall. So a 9mm carbine with hollow points would satisfy my firearm preference and meet ballistic requirements/ limitations.

[TTS]

A logical application for it would be someone who likes a carbine platform for home defense but doesn't want to shoot through walls and possibly have collateral damage. Ex. I live in a townhouse and and can only safely defend myself in two directions because I have neighbors on my east wall and on my south wall. So a 9mm carbine with hollow points would satisfy my firearm preference and meet ballistic requirements/ limitations.

.223 penetrates far less drywall and wood than 9mm, that is why so many police departments have switched to it.

Here is a test, there are many more floating around out there.
http://how-i-did-it.org/drywall/results.html

[AR-15collector]

A logical application for it would be someone who likes a carbine platform for home defense but doesn't want to shoot through walls and possibly have collateral damage. Ex. I live in a townhouse and and can only safely defend myself in two directions because I have neighbors on my east wall and on my south wall. So a 9mm carbine with hollow points would satisfy my firearm preference and meet ballistic requirements/ limitations.

.223 penetrates far less drywall and wood than 9mm, that is why so many police departments have switched to it.

Here is a test, there are many more floating around out there.
http://how-i-did-it.org/drywall/results.html

You're kidding right?

[LarryFlew]

No he isn't. Has been shown many times by a lot of different testers.

[AR-15collector]

Interesting, I'd have figured slower speed means less penetration of building materials, never took fragmentation into account.

[TTS]

Interesting, I'd have figured slower speed means less penetration of building materials, never took fragmentation into account.

You should see when a .223 is shot into water, it doesn't make it more than a few feet.

[xd ED]

Interesting, I'd have figured slower speed means less penetration of building materials, never took fragmentation into account.

You should see when a .223 is shot into water,it doesn't make it more than a few feet.

Most rounds don't.


Another source for ammo penetration testing:

The Box of Truth

[jdege]

This is just my own ignorance, but why would anyone pick a 9mm AR over a 5.56?

Nobody ever should.

The idea of owning a 9mm carbine of any sort is a mark of utter stupidity.

If you own one, you should get rid of it as soon as possible. (If you'd like, I'd be willing to relieve you of the problem for a small fee )

[TTS]

Interesting, I'd have figured slower speed means less penetration of building materials, never took fragmentation into account.

You should see when a .223 is shot into water,it doesn't make it more than a few feet.

Most rounds don't.


Another source for ammo penetration testing:

The Box of Truth

I usually like the box of truth, but his drywall test failed because of the close proximity of the boards. If you space drywall out to actual room distance very different results will appear with many small high velocity rounds like .223.

In either case, I don't think someone will be let down by a pistol caliber carbine or a rifle caliber carbine. Both are viable options for self defense and each has its own benefits and drawbacks.

[JFettig]

They are kind of fun, not expensive to shoot either. I built one a few years back that took Sten mags

[mulletpoker]

check out the ballistics of a 16" barrel with +P+ ammo and then consider a magazine capacity of 30 (or more). 'nuff said.

[Seismic Sam]

I did see an AR at Bill's that took 45 ACP ammo, and the end of the barrel liked pretty much like a Thompson. Dunno if it would take Thompson mags or not, but the magwell looked to be double stack dimensions. If the action's the same rotary bolt, that would mean that you could probably go 45 Super and with a 16"barrel and the right powder you might be able to come up with some pretty respectable loads.

I'd suggest a new barrel and diddling the mag lips to make a 50GI AR, but I ALREADY have a 50AE AR, so there's no point, and that one is supremely badass!!