What’s the loudest AR15 caliber?

[That_FNG]

so I was bored at work today and got to thinking, what is the loudest caliber you can shoot out of a 16” barrel with a big muzzle brake? Like if I wanted to build an AR15 with a 16” barrel simply for the purpose of being loud and lots of muzzle flash.

I’m thinking maybe 450 bushmaster or 50 Beowulf?

 

[Marine Cpl]

.300 Blackout. One shot and it's lights out!

 

[That_FNG]

.300 Blackout. One shot and it's lights out!

Well 300 blackout with subsonics would probably be the quietest caliber. I’m talking if I simply wanted to make an obnoxiously loud AR15 with a 16” barrel what the loudest caliber would be lol

 

[Podmonkey]

High pressure cartridges are the loudest.
Cartridges that are underbore are also usually louder than average. I'd bet the .204 Ruger is quite loud. ARs chambered in calibers such as 22-250 and .243 are probably also extremely loud.

 

[Marine Cpl]

Well 300 blackout with subsonics would probably be the quietest caliber. I’m talking if I simply wanted to make an obnoxiously loud AR15 with a 16” barrel what the loudest caliber would be lol

I know. Just giving you shit.

 

[Podmonkey]

The loudest ARs are probably those rareified behemoths in .338 Lapua.

 

[Podmonkey]

That said if you simply seek to make a nuisance of yourself on the range a 5.56 pistol with a brake will obnoxiously noisy.

 

[That_FNG]

I’m talking an AR 15 rifle. So it has to have a 16 inch barrel and be made on an AR15 lower, thus ruling out AR10 or AR15 pistol

 

[That_FNG]

I’m now toying with the idea of building something. I have an AR15 lower I could use and a stripped AR15 upper on hand

 

[BDinPutnam]

.375 H&H.

 

[That_FNG]

.375 H&H.

Never heard of that in the AR15 platform

 

[Edwardteach72]

.50BMG

Duh


SHTF 50 Single Shot Upper Conversion - Safety Harbor Firearms

 

[Acer-m14]

soak the lower in some vinegar and stretch it out .. then mount a A10 30mm barrel on it

 

[Bananabandit]

sounds like you need a hobby

 

[ArmedCorgi]

Do you need a special upper (aside from barrel and BCG) for 458 socom? Or will any stripped AR15 upper work?

 

[That_FNG]

Do you need a special upper (aside from barrel and BCG) for 458 socom? Or will any stripped AR15 upper work?

I think it’s just barrel and bolt

 

[dsdmmat]

Make sure to put a flash enhancer on your loud upper as well. Might as well be the brightest while being the loudest.

 

[Edwardteach72]

Do you need a special upper (aside from barrel and BCG) for 458 socom? Or will any stripped AR15 upper work?

Needs upper

https://www.brownells.com/rifle-par...58-socom-billet-upper-receiver-prod70965.aspx

 

[ArmedCorgi]

Needs upper

https://www.brownells.com/rifle-par...58-socom-billet-upper-receiver-prod70965.aspx

Thanks. So I take it it's really just the ejection port that is the issue?

 

[Edwardteach72]

Thanks. So I take it it's really just the ejection port that is the issue?

Yeah I do believe some places will even modify a standard upper but hell you can get a big bore poverty pony upper for like $90 so why not just get a dedicated one vs paying someone to fuck around with a stock ar15