.45acp 8in barrel sound levels?

[Kwiercyski]

Hi, new here, im looking to build a suppressed focused rifle(ahem, pistol), and was thinking about going .45acp. It's cheaper then 300blk easy to reload and carries some balls. Plus subsonic greenbox hp's are a plus and I already got the 45 dies. I was going to give it an 8in barrel and the hybrid 46. Does anyone have any experience with this set up? I'm preferably looking for a wisper quiet gun to shoot on the back of my wooded 4 Acer lot. They say the suppressors are good to 130db but that's assumingly with a 4in barrel. Will the additional 4inches have any noticeable affect on the sound level? I want the ability to get stupid back there without the neighbors being any the wiser. (The sit 200 yards away through woods)

[fishman]

It's not gonna be "neighbors don't notice" quiet, but it might be "neighbors don't realise those are gunshots" quiet. If you're doing a semi auto, don't bother chasing decibels; it won't ever get crazy quiet. A non-semiauto, a bigger silencer, and/or An integral design can get you VERY quiet.

[CanOfWhooppass]

I just did this, here are some things to consider. I went 300 blackout which is quieter than 9mm which is quieter than 45acp. In an AR platform the pistol calibers are simple blowback, while 300Blk is DI so the bolt locks. I used an adjustable gas block so i have the option of turning it off to run it as a straight pull bolt action. Accuracy with 220gr rem subsonic is just under 2 inch at 100 yards. That was with a very dirty 8.3" BA barrel, red dot and 3x magnifier. Liked it so much I'm building a 10.3" 416 stainless version with 3-12x scope to try and get sub MOA with.

I have 9mm ARs, 45 pistols and none can match the sound or accuracy of my 300blk builds. 300blk semi will make you smile, but shut off the gas and manually cycle it... now you are full on giggling like a school girl.

If you are playing in the woods, remember that these rounds hit a tree like a hammer, the impact alone will sound like... a hammer.

[fishman]

In an AR platform the pistol calibers are simple blowback, while 300Blk is DI so the bolt locks.

delayed blowback 45 and 9 are available. DI 45 is available. Piston 9mm is available (mpx). 45 and 9 will be way cheaper for OP if he doesn't reload. If OP does reload, 300 is also a great option.

[Kwiercyski]

Thanks guys! So what your sorta getting at is the expanding gas from the chamber side ejecting the round is still a source of quite a bit of sound. So if I want that Hollywood magic I would have to go DI and close off the gas?? Makes sense. Then I still have the opportunity to open her up and run it semi if I wanted to. So it looks like 300blk is the way to go. I just assumed 45 would be the quieter option.... Well u guess that's why there so popular

[doubloon]

...
If you are playing in the woods, remember that these rounds hit a tree, a rock, a mound of dirt, a pig like a hammer, the impact alone will sound like... a hammer.

[Kwiercyski]

In regards to reloading I only have the 45 dies. I never dabbled in rifle rounds because I heard they were more complex and just never really decided to venture down that route. delayed blowback 45 would be a good option because I can reload at around $0. 35 a round. The factory bought subsonic 300 BLK is pushing a dollar? It's just supposed to be a fun going to play around with when I'm bored nothing too fancy.

[fishman]

In regards to reloading I only have the 45 dies. I never dabbled in rifle rounds because I heard they were more complex and just never really decided to venture down that route. delayed blowback 45 would be a good option because I can reload at around $0. 35 a round. The factory bought subsonic 300 BLK is pushing a dollar? It's just supposed to be a fun going to play around with when I'm bored nothing too fancy.

Rifle reloading isn't hard. Don't stress about that.

Blowback guns are the loudest. Bolt guns and anything manually cycled are quietest. Delayed blowback, piston, and DI are in between (a good compromise between the two).

DI45
https://maconarmory.com/products/11-upp ... mpingement

Delayed blowback 45 and 9
https://www.cmmginc.com/product/pistol- ... sb-45-acp/
https://www.cmmginc.com/product/pistol-mkgs-psb-9mm/
https://www.cmmginc.com/product/pistol- ... sbn-guard/
Kriss vector 9,40, or 45

Piston 9mm
https://www.sigsauer.com/products/firea ... es/sigmpx/

[Kwiercyski]

Blowback guns are the loudest. Bolt guns and anything manually cycled are quietest. Delayed blowback, piston, and DI are in between (a good compromise between the two).

DI45
https://maconarmory.com/products/11-upp ... mpingement

Delayed blowback 45 and 9
https://www.cmmginc.com/product/pistol- ... sb-45-acp/
https://www.cmmginc.com/product/pistol-mkgs-psb-9mm/
https://www.cmmginc.com/product/pistol- ... sbn-guard/
Kriss vector 9,40, or 45

Piston 9mm
https://www.sigsauer.com/products/firea ... es/sigmpx/

Thanks! I like the idea of getting one of them guards that way it's done and over with quick and easy. But I also like the idea of having control of the gas... Hmm decisions

[fishman]

Blowback guns are the loudest. Bolt guns and anything manually cycled are quietest. Delayed blowback, piston, and DI are in between (a good compromise between the two).

DI45
https://maconarmory.com/products/11-upp ... mpingement

Delayed blowback 45 and 9
https://www.cmmginc.com/product/pistol- ... sb-45-acp/
https://www.cmmginc.com/product/pistol-mkgs-psb-9mm/
https://www.cmmginc.com/product/pistol- ... sbn-guard/
Kriss vector 9,40, or 45

Piston 9mm
https://www.sigsauer.com/products/firea ... es/sigmpx/

Thanks! I like the idea of getting one of them guards that way it's done and over with quick and easy. But I also like the idea of having control of the gas... Hmm decisions

Get a guard AND a 300 blackout. I did lol.

[Capt. Link.]

It's not gonna be "neighbors don't notice" quiet, but it might be "neighbors don't realise those are gunshots" quiet. If you're doing a semi auto, don't bother chasing decibels; it won't ever get crazy quiet. A non-semiauto, a bigger silencer, and/or An integral design can get you VERY quiet.

One of little faith my friend.The .45acp can be Hollywood quiet even in a blow-back pistol.The AAC can run wet is a dream with full power loads.
-CL

[fishman]

It's not gonna be "neighbors don't notice" quiet, but it might be "neighbors don't realise those are gunshots" quiet. If you're doing a semi auto, don't bother chasing decibels; it won't ever get crazy quiet. A non-semiauto, a bigger silencer, and/or An integral design can get you VERY quiet.

One of little faith my friend.The .45acp can be Hollywood quiet even in a blow-back pistol.The AAC can run wet is a dream with full power loads.
-CL

I guess that depends on what you consider "Hollywood quiet". I've seen movies where a person in the same room doesn't notice the silenced shot. Total bs.

People have very different expectations from silencers. My dad was unimpressed with my 300 blackout with the gas turned off, while I was ecstatic with its performance. My integrally suppressed 45 guard, plus water, is very quiet, but not "people 100 yards away dont notice" quiet. They wouldn't guess it was a gunshot though.

[CanOfWhooppass]

In an AR platform the pistol calibers are simple blowback, while 300Blk is DI so the bolt locks.

delayed blowback 45 and 9 are available. DI 45 is available. Piston 9mm is available (mpx). 45 and 9 will be way cheaper for OP if he doesn't reload. If OP does reload, 300 is also a great option.

True, but chasing Hollywood quiet some of this falls short in my opinion. Delayed locking devices you can't shut the gas off to stop action noise as an option.
The DI like bazooka brothers is interesting, but I believe the gas system is custom and did not think I could add an adjustable gas block.
Regardless, the best 45 suppressors are still about 10db louder than the best 300Blk.
Not knocking pistol calibers SBRs, have several.
I think my 300blk with gas shut off is as quiet as the De Lisle inspired carbine I was originally considering, but with the bonus of semi-automatic if I want.

[CanOfWhooppass]

If you end up considering an AR that you can run as a straight pull bolt action keep a couple things in mind.
First, not all gas blocks shut completely off, I am using the Odin which is nice, but will not fit under slim handguards.
Second is that a side charger is far more convenient, I am using the Gibbz and like it.
An AR straight pull doesn't have that cam action that pulls the cartridge back as you rotate the bolt handle. That makes them a little stickier, especially on a dirty chamber with super sonic rounds.

Also, if you run semi-automatic you don't need an adjustable gas block for function, but adjusting down to where subs only cycle with a suppressor attached seems to be a little quieter than wide open.

[ECCO Machine]

One of little faith my friend.The .45acp can be Hollywood quiet even in a blow-back pistol.The AAC can run wet is a dream with full power loads.
-CL

What blowback .45 ACP is there besides the Hi Point?

Most blowback guns produce substantial port noise, not a lot you can do about it. The ones with really heavy bolts aren't much different than a locked breech gun, but on the other end of the spectrum, guns like the Marlin Camp 45 will snap your ears no matter what can is on it. Many blowback centerfire pistols are a similar story; my CZ83 is painful on the ears with any can, even the Osprey or my Phoenix IX.

I am currently working on a new prototype design specifically aimed at reducing port noise with blowback carbines, but it's a tough nut to crack. Stay tuned.

[fishman]

What blowback .45 ACP is there besides the Hi Point?

ump45. most 45 ARs. Thompson. Reising. Mac-10. Grease gun. [a dozen other examples]

Edit: I didn't realise we were taking about pistols, although link may have been referring to an AR pistol or similar.