The post whore thread.

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Originally Posted by HoneyBadger

How does suppression affect gassing for DI guns like ARs and what can you do about it beside an adjustable gas block? I'm assuming that a can raises the gas pressure? Would changing your buffer weight have any useful affect? Is that more of a bandaid than a solution?

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The increased back pressure (caused by a can) increased bolt speed. The bolt moveg so fast that the rest of the system can't keep up. Several things indicate excessive bolt speed. In mine, the indicator was that the follow on round was double-feeding, but not in the normal sense as it wasn't caused by a magazine failure. The (just fired) brass hadn't cleared the chamber by the time the bolt slammed home with a new round.

Brass not clearing the chamber is excessive bolt speed and the bolt needs to be slowed down. I put in a heavier spring and used a carrier weight to try and slow it down. No dice.....and I put a HEAVY system in that gun. There's just too much gas going back.

The only other thing is too much gas and an adjustable gas block is the way for that.

Today's a great day to not have to leave the house.

http://i.imgur.com/HyYgvH3h.jpg

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Originally Posted by TheBelly

Turns out, the PredatAR is a little overgassed.

If I want that thing to run suppressed, I'll need to change the gas block to an adjustable.

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I can't get my Sig716P to cycle suppressed on any setting with the PCI group buy .308 ammo. Runs fine with good ol PPU and my own dang low power M80 loads. I guess maybe they're just too hot. I have not put a chrono to them.

Anyone need a good deal on some nice M80 ball steel?

Quote:

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Originally Posted by HoneyBadger

How does suppression affect gassing for DI guns like ARs and what can you do about it beside an adjustable gas block? I'm assuming that a can raises the gas pressure? Would changing your buffer weight have any useful affect? Is that more of a bandaid than a solution?

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Depends on the can too.

My .30 cal can runs fine on the DI 5.56. Just a little less sound suppression, but less gas to blowback in your face or cause cycling issues. AAC claims they designed the can to create less back pressure.

Except for my Sig 716P not cycling the PCI M80 loads when suppressed, I've had zero issues cycling anything else with that AAC can. We'll see when I build a 10.5 upper how that plays out. I'm thinking I'll have to work on an adjustable system and am considering just going to an AA piston setup.

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Originally Posted by Ridge

Today's a great day to not have to leave the house.

http://i.imgur.com/HyYgvH3h.jpg

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Almost every day unless I'm traveling.

:-P

I suppose I do need to go out and shovel/blow snow (north facing drive.)

Thanks for the good info guys. [Beer]

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Originally Posted by brutal

Depends on the can too.

My .30 cal can runs fine on the DI 5.56. Just a little less sound suppression, but less gas to blowback in your face or cause cycling issues. AAC claims they designed the can to create less back pressure.

Except for my Sig 716P not cycling the PCI M80 loads when suppressed, I've had zero issues cycling anything else with that AAC can. We'll see when I build a 10.5 upper how that plays out. I'm thinking I'll have to work on an adjustable system and am considering just going to an AA piston setup.

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If it has baffles inside of a tube, it creates backpressure. They try to minimize it, but there is no magic bullet, as far as baffled cans are concerned. I've only seen one can NOT create excess back pressure, but they are expensive and they don't use baffles like a suppressor that we'd think of these days.

Piston driven systems have a few problems in their execution, but that's a cost/benefit that you're going to have to make for yourself.

Howdy fellers...

Don't look now, but I think there was another grouping of quality posts in the post whore thread. Nice info, and thanks for that.

Yeah, every once in a while I ask a decent question and get an honest and helpful answer from these whores. :D

[handbags]