AR chambered in .45

[JHZR2]

Originally Posted By: spasm3
Has anyone heard an AR fired in .45 cal? I have been told due to the subsonic round that it can be fired without hearing protection. With less muzzle flash and sound , might be a good close quarters house rife?


This makes almost zero sense to me.

How about a 20 or 12ga?

 

[billt460]

Originally Posted By: JHZR2
Originally Posted By: spasm3
Has anyone heard an AR fired in .45 cal? I have been told due to the subsonic round that it can be fired without hearing protection. With less muzzle flash and sound , might be a good close quarters house rife?


This makes almost zero sense to me.

How about a 20 or 12ga?


Me either. I don't understand where all of this nonsense comes from, about firing weapons indoors without hearing protection? If you fire ANY weapon indoors without hearing protection, you will suffer some degree of permanent hearing loss. Any Ear / Nose / & Throat Specialist will confirm that. A human inner ear is very delicate. It takes very little to damage it.

 

[ZeeOSix]

Just hold the intruder at gunpoint until you put hearing protection on ...

But seriously, guess I'd rather have hearing damage then be dead if that's what it came down to. A semi-auto .22 rifle with 1400 fps CCI Stinger hollow points would probably be easier on the ears than a high powered pistol.

 

[Panzerman]

Seriously you have a intruder in your house that may kill you, rape your wife and then kill her too and you are concerned that you may damage your hearing if you fire a gun in the house. This country is doomed.

 

[billt460]

Originally Posted By: ZeeOSix
Just hold the intruder at gunpoint until you put hearing protection on ...

Originally Posted By: Panzerman
Seriously you have a intruder in your house that may kill you, rape your wife and then kill her too and you are concerned that you may damage your hearing if you fire a gun in the house. This country is doomed.


I agree with both of you. If you have to shoot, hearing loss is going to be the least of your problems. That said don't try to B.S. yourself there are guns that will allow you to do it without it having an effect. Especially with large bore centerfires indoors.

 

[spasm3]

Originally Posted By: billt460
Originally Posted By: ZeeOSix
Just hold the intruder at gunpoint until you put hearing protection on ...

Originally Posted By: Panzerman
Seriously you have a intruder in your house that may kill you, rape your wife and then kill her too and you are concerned that you may damage your hearing if you fire a gun in the house. This country is doomed.


I agree with both of you. If you have to shoot, hearing loss is going to be the least of your problems. That said don't try to B.S. yourself there are guns that will allow you to do it without it having an effect. Especially with large bore centerfires indoors.



I guess i did not state my interest well, causing a lot of assumptions on reader interpretation.

I was interested in whether a shorter subsonic pistol round would be quieter in a longer barreled AR than a pistol. I did in fact wonder if you could fire it outdoors with out hearing protection. I never meant to imply that you could fire it indoors without issue. Of course for self defense it would not matter, but might be a side benefit if is was somewhat quieter. I worded it poorly.

My AR in 7.62x 39 would be a poor choice in an indoor situation as it would go through the subject , all the walls of my home and possibly into a home some distance away. It also has a huge muzzle flash. That was my second interest in a pistol round. Third interest was using the same ammo in a pistol and a rifle, and with the right gun even magazines.

I am considering another AR and those were my interests for something different than a 100yd + range gun.

 

[spasm3]

Here is a thread from the AR-15.com forum that sparked my interest.

https://www.ar15.com/forums/ar-15/-/118-283582/?

 

[bubbatime]

Yes a .45ACP carbine will be much quieter than any other popular centerfire cartridge out of a rifle I can think of. My Beretta 45ACP carbine was insanely quiet compared to just about anything else. Honest to god, some guy asked me if it was internally silenced, and where the suppressor was.

.45ACP runs at 19000 PSI

9MM and .357 Magnum run at 35000 PSI. Almost twice the pressure of .45ACP.

 

[Ducked]

Originally Posted By: bsmithwins


Pistol cal carbines have enough compromises that I wouldn't recommend one as a primary bump in the night tool. You'd be much better served by a compact rifle or shotgun.



A rifle that'll shoot through a few walls, with a lethal range of over a mile, might be a little too uncompromising for urban, suburban, or even rural home defense.

I've got no experience of pistol calibre carbines. AFAIK there was nothing close in the British Army standard inventory (Sterling SMG would be closest I've experience of) but I noted in Northern Ireland that the Royal Ulster Constabulary were using M1 Carbines, as used by US forces in WW2 and Korea. I assumed this was to reduce the collateral damage potential relative to a rifle-calibre round.

 

[Cujet]

Originally Posted By: spasm3

I was interested in whether a shorter subsonic pistol round would be quieter in a longer barreled AR than a pistol. I did in fact wonder if you could fire it outdoors with out hearing protection.
I am considering another AR and those were my interests for something different than a 100yd + range gun.


Yes, much quieter than a "the loudmouth" 45ACP pistol.
Yes, you can easily fire it without hearing protection outside AND many people who own a 45 carbine do just that. A 16.5 inch barreled 45ACP is still loud without hearing protection, but it's not ear-shatteringly loud. I hope that makes sense to you. I guess the way to put it is that I use earplugs at rock concerts. I don't use earplugs when firing a 22 bolt action with 60g SSS subsonic rounds. I do use earplugs with the 45 carbine most of the time.

I too want to build a nice looking AR in 45ACP for backyard plinking.

 

[bubbatime]

Originally Posted By: Ducked
Originally Posted By: bsmithwins


Pistol cal carbines have enough compromises that I wouldn't recommend one as a primary bump in the night tool. You'd be much better served by a compact rifle or shotgun.



A rifle that'll shoot through a few walls, with a lethal range of over a mile, might be a little too uncompromising for urban, suburban, or even rural home defense.

I've got no experience of pistol calibre carbines. AFAIK there was nothing close in the British Army standard inventory (Sterling SMG would be closest I've experience of) but I noted in Northern Ireland that the Royal Ulster Constabulary were using M1 Carbines, as used by US forces in WW2 and Korea. I assumed this was to reduce the collateral damage potential relative to a rifle-calibre round.


Common misconception. The most recommended rifle caliber, .223, usually penetrates less walls than 9MM or .45ACP handgun rounds through walls. One of the main reasons why US SWAT teams ditched the 9MM MP5 sub-machine gun, and almost universally now use AR15 rifles.
http://how-i-did-it.org/drywall/results.html

 

[Ducked]

Originally Posted By: bubbatime
Originally Posted By: Ducked
Originally Posted By: bsmithwins


Pistol cal carbines have enough compromises that I wouldn't recommend one as a primary bump in the night tool. You'd be much better served by a compact rifle or shotgun.



A rifle that'll shoot through a few walls, with a lethal range of over a mile, might be a little too uncompromising for urban, suburban, or even rural home defense.

I've got no experience of pistol calibre carbines. AFAIK there was nothing close in the British Army standard inventory (Sterling SMG would be closest I've experience of) but I noted in Northern Ireland that the Royal Ulster Constabulary were using M1 Carbines, as used by US forces in WW2 and Korea. I assumed this was to reduce the collateral damage potential relative to a rifle-calibre round.


Common misconception. The most recommended rifle caliber, .223, usually penetrates less walls than 9MM or .45ACP handgun rounds through walls. One of the main reasons why US SWAT teams ditched the 9MM MP5 sub-machine gun, and almost universally now use AR15 rifles.
http://how-i-did-it.org/drywall/results.html


Interesting. Didn't know that. The comments on relative range still seem valid, however.

Not directly relevant to this discussion, but the British std rifle at the time used the NATO 7.62 mm round. The RUC probably considered that too much gun, as well as having...er... negative associations for the local population. They did use the Sterling, though.

 

[spasm3]

Originally Posted By: bubbatime


Common misconception. The most recommended rifle caliber, .223, usually penetrates less walls than 9MM or .45ACP handgun rounds through walls. One of the main reasons why US SWAT teams ditched the 9MM MP5 sub-machine gun, and almost universally now use AR15 rifles.
http://how-i-did-it.org/drywall/results.html



Interesting! Thanks for the link bubbatime!