Suppressor reverse compatibility.

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Brilton

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Feb 25, 2011
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Ok suppressor guys, question. I'm looking into getting a couple suppressors and if possible would like them to work with more than one caliber. So my question is; say I buy a suppressor in 7.62 and shoot calibers beneath it, like 5.56, is it as effective as shooting the round it's designed for or will reverse compatibility really happen? I just worry because of the differing diameters of both the rounds being too small rendering baffles ineffective and barrel diameters, I.e. a .45 suppressor attaching to a 9mm barrel thread. Any further info would be appreciated.
 
I would think it's possible but the effectiveness would be reduced to a degree.
 
It's very common for people to buy 7.62 suppressors for .223 rifles. .45 cans also work on 9mm guns. In general, they work well. That said, the best suppressor for a particular caliber is one designed around that caliber.
 
I kind of figured as much. I really only want 9mm and 5.56. Suppressors in higher calibers are kind of ineffective, at least the ones I've shot. 9mm has the best performance I've seen next to a .22.
 
The difference between using a .30 caliber suppressor on a .30 caliber rifle versus .223 caliber rifle is minimal. Depending on ammunition, barrel, and environmental factors you're looking at less than 3dB difference at most. There are .30 caliber suppressors from different manufacturers that have a larger difference than that on a .30 caliber rifle.

In the grand scheme of things, for centerfire rifle it's fine and dandy to use a .30 caliber suppressor on a .223 rifle. Pistols do better with dedicated suppressors.
 
I have a YHM 7.62 QD Titanium Phantom. Use it on my AR10 clone and all my AR15's. It actually sounds TO ME quieter on the AR15's. The exit hole is .380 in dia. which is .072 larger than the 308 dia bullet.

I ONLY shoot full power ammo through it, so the supersonic crack of the bullet will more than drown out any difference in performance. For those who have never experienced suppressed fire in person, let me tell you the bullet makes a LOT of noise when it breaks the speed of sound. Sounds just like someone firing an un-suppressed .22LR with high velocity ammo. I recently stood 50 yds downrange about 15 yds away from the path of the bullet (behind a berm) and had a friend fire my AR10 from the bench. I heard absolutely NO SOUND from the direction of the bench. The crack of the passing bullet sounded like someone standing 15 yds away firing the aforementioned .22LR. The sound followed the bullet downrange. I'm sure if the bullet wasn't making all that noise, I could have heard something from the direction of the shooter, but all the noise I heard came from the point in the bullet's flight that was nearest to me at the 50 yd line. Unless you were very close to the shooter, you would not be able to tell where the shot came from.

I tried some subsonic loads for the .308 just for sh%$s and grins and it was very quiet except the bolt partially opened and then slammed shut because I couldn't turn the gas off. Since I have no practical use for subsonic rds I won't be using them anyway, but shooting subsonics is the ONLY way you might ever notice a difference in performance when shooting smaller calibers through a larger can, and I'm not convinced of that. Of course most pistol rds that are suppressed are subsonic anyway.
 
Remember, the volume of the can is larger in a 30 caliber can vs. .223. Even though the exit hole is bigger, the volume of the can will generally more than make up for it. The most 30 cal suppressors will sound as good, if not better on a .223 than a .223 dedicated can. It will be LARGER though, and heavier.

Similarly using .45 cans on 9mm will have a similar effect. There is a video from silencerco showing the .45 can on a 9mm host has a louder first round pop, but the subsequent rounds are as quiet, perhaps a bit quieter than the 9mm dedicated can on a 9mm host.

Shoot your sub calibers and enjoy.
 
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