Suppressors Subsonic not cycling AR??

[coyotekiller]

I am shooting a Asa upper with seekins lower 18" barrel with mid length gas. Seekins adj gas block opened all the way up. Load is 55 gr vmax with 5.5 trailboss at 1100fps. Very quiet but does not even move bolt. 1/2 gr more and get sonic crack with bolt still not moving. Is there a buffer or light weight spring I need to be using?

 

[QuietShootr]

Subsonic 5.56 doesn't cycle. That's one reason .300BLK is popular.

 

[BurnOut]

Are you sure that the gas block is all the way open? It doesn't sound like it is.

Have you tried adjusting it all the way to the "other" side? Is there a way to ensure that it's actually adjusting? Might there be a blockage of some sort in the barrel port, gas block, or gas tube? The bolt not even moving with supersonic ammo just doesn't sound kosher, IMO.

 

[BLDTYLRY]

You need to do one or all of the following:
1. Enlarge the gas port on the barrel
2. Reduce BCG Weight
3. Reduce Buffer Weight
4. User a Lighter Buffer Spring

I will get a hold of a JP LMOS and Captured Spring and mess with the weights and spring weights

 

[BurnOut]

Subsonic 5.56 doesn't cycle. That's one reason .300BLK is popular.

It can: Beck Ammunition | subsonic ammo | .308 subsonic ammo | 223 subsonic ammo | 308 subsonic ammo

 

[QuietShootr]

It can: Beck Ammunition | subsonic ammo | .308 subsonic ammo | 223 subsonic ammo | 308 subsonic ammo

RIF:

"PLEASE READ DESCRIPTION!!! THIS AMMO ONLY CYCLES IN OUR CS UPPER or CS RIFLE"

 

[BurnOut]

RIF:

"PLEASE READ DESCRIPTION!!! THIS AMMO ONLY CYCLES IN OUR CS UPPER or CS RIFLE"

Yep... I was just saying that it can be done.

 

[BLDTYLRY]

Also, once you've tested the load to ensure it is stabilizing, having a suppressor on the weapon increases the back pressure. So before you play with weights you're weapon may already cycle the round. I'm still waiting for my Saker but I will be testing my subsonic handloads through my Osprey to see if the increased back pressure helps to cycle the action.

 

[coyotekiller]

It cycles fine with my reg load but I just started with the subs and was wondering what to do. With the suppressor on it does nothing but is sneaky quiet. I will just stay with a reg load then and shoots the subs through the bolt.
I am also starting on my pof 308, will they cycle subs or no. Hell if it won't I may dump it and stick with the bolt guns.


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[BLDTYLRY]

You'll have the same issue with the AR308 as you do with the AR15 trying to cycle subs.

Fortunately my AR308 build already has an oversized gas port on the barrel, JP LMOS Carrier and Silent Captured Spring....so I'm ready to play with weights for this system.

 

[QuietShootr]

I am also starting on my pof 308, will they cycle subs or no.

Nope.

 

[BurnOut]

POFs have a dual setting on the gas block... one for shooting suppressed, the other for shooting unsuppressed. What I don't know is whether or not the "suppressed" setting will allow for subs to cycle. If I had to guess, the answer would probably no... I would assume that that setting actually allows less gas to get to the piston to compensate for the back pressure created by the can while shooting super loads.

That said, you know what they say about assumptions, though....

 

[rmfield]

With all due respect, I think you are wasting your time. I've played around with subs in the 300 BLK enough to know that what you are trying to do will be very challenging and the result will be a rifle that can realistically only shoot subs (at best). Why don't you just buy a 22 rimfire upper? It would be cheaper and easier and you will end up in about the same place plus you won't trash your existing ASA upper.

 

[Javelin]

You just need to buy a .22 if you want subsonic 5.56

There's a reason why many of us have spent thousands and thousands on 300BLK because it does the subs brilliantly.

And moving on

 

[jasonfaz]

Subs DO NOT cycle in a semi-auto 5.56 or 308. The 300 BLK is what you want. However, while cycling subs in a S/A platform is 100% 300 BLK you can get 5.56 subs (specifically the 52 gr HPs from Beck) to run QUIETER than a 22LR - but again, they wont cycle. I run those through a 7" 5.56 with M4-2k and they are quieter than my 16.5" Savage with Sparrow both with subs. Grab a side-charging upper and you'll be able to cycle that upper faster than a bolt gun...

 

[Myanmar Shave]

LR-308 SBR as referenced in this thread:

http://www.snipershide.com/shooting...ushmaster-308-hunter-tb-30-p1-suppressor.html


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