SBR AR with fixed suppressor question

SCARCQB · May 26, 2015

Unless it's a 300 blk or 9 mm. It's not worth the trouble. The 5.56 with a short barrel and a short can will not be hearing safe anyways.

Gas volume or size does matter in suppressors.

clandestine · May 26, 2015

jimbobborg said:
Is there a point of diminishing returns with this? What would be the optimal size for a short-barreled rifle can?

SCARCQB said:
Unless it's a 300 blk or 9 mm. It's not worth the trouble. The 5.56 with a short barrel and a short can will not be hearing safe anyways.

Gas volume or size does matter in suppressors.

SCAR said what I would have said.

clandestine · May 26, 2015

outrider58 said:
...and clandestine's longer than mine. I seen it AR rifle school.

Drmsparks · May 26, 2015

I am currently debating between a 7.5 inch barrel and a 9" can or 10.5" barrel and 6"can.

Listening to the comments above it sounds like 7.5 and 9" is the way to go (9mm setup)

clandestine · May 26, 2015

Drmsparks said:
I am currently debating between a 7.5 inch barrel and a 9" can or 10.5" barrel and 6"can.

Listening to the comments above it sounds like 7.5 and 9" is the way to go (9mm setup)

Gotta be careful with long 9mm barrels. Make sure the additional length does not cause 147 to go supersonic.

Drmsparks · May 26, 2015

clandestine said:
Gotta be careful with long 9mm barrels. Make sure the additional length does not cause 147 to go supersonic.

From what I read, 10.5 is a long as you can go reliably, hence why the 7.5 was winning out. The 10.5 hit's on a weird bubble that while not quite supersonic makes more noise than bullets travelling a 100fps or so slower.....

course that was from some guy on the intertubes (m4 carbine.net) so I'm still doing more research, but the 7.5 seems the best choice.

SCARCQB · May 26, 2015

9mm. Go with a 4"-6" barrel then the rest should be baffles.

Less is more( in terms of barrel length ) and size matters ( in terms of gas volume)

One drawback on larger cans is that it is prone to a louder first round pop. The can will contain enough oxygen to serve as a combustion chamber. To eliminate that, a quick spray of wd40 or wire pulling gel , water , anti freeze etc. helps.

engineerbrian · May 26, 2015

teratos said:
You will get some suppression with a short can. Not a lot. The factors that affect how quiet it can be are volume of the can and the number of baffles. Take a look at the monster on the De Lisle carbine.

Hell yeah!!!! Love this gun.

[YT]IsUALdGog4U[/YT]

SBR AR with fixed suppressor question

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