Another suppressor question, bare with me folks.

Are gas operated firearms, DI, piston, etc. quiter than blow back when using a suppressor?

Say, if you used a DI .45 acp AR15 upper, vs a blow back upper, would the DI be signficantly quiter?

I was just pondering, and it seems like it would be quiter technically, but just thought I would ask.

Gas Piston in my opinion.

The GPU is the quietest I have heard yet and less gas out the ejection port.

I have only shot three different manufacturers of Pistons and three different manufacturers of Cans, so my experience is kinda limited.

Well you have a few different sources for noise.

Unburned gas
supersonic projectiles breaking the sound barrier
mechanical noise

I don't know from experience, but here are some things to consider.

A 45 ACP is a low pressure round and coming out of a carbine lentgh barrel it should have burned the majority of it's powder.

The projectiles are usually subsonic to begin with

This leaves us only with mechanical noise
- a large heavy reciprocating bolt in a blow back system will make a pretty significant slam home.
- a piston system has potential to make several noises as the piston strikes the bolt carrier, but they may all be quieter due to lower mass.
- a DI system has low mass and there shouldn't be much gas driving it (do they even use DI for pistol cal carbines or SMGs?)

I do know from experience that for some reason .45s seem to be difficult to supress.

Thanks guys




Yup, they are rare, but they exist.

http://bazookabrothers.com/products2.htm

now ya know why I'm havin them decision issues bro

Mechanical noise is not an issue

when shooting suppressed you hear the what sounds like the hard thump from a pellet gun from the rifle and super sonic crack of the round, which the crack is much louder than anything.

I stood roughly 35 yards away from my dad Tuesday while he was shooting my can and did not hear the rifle other than a pellet rifle sound, but the crack from the bullet echoed through the hollowers.

Like I said the SAS cans are quiter than a 22 shooting the privi or xm-193