AR suppressor problem

Mosol · April 17, 2025, 11:58 PM

Im trying to figure out why an AR in 7.62x39 operates fine when unsuppressed but jams every shot or every second shot when firing suppressed?

Firing from a 16” barrel using a SilencerCo Omega300

is the rifle with suppressor on not getting enough gas to operate correctly or maybe getting to much gas and failing to operate correctly? Any ideas?

Thanks ahead of time.

Shadow9mm · April 18, 2025, 06:06 AM

What do you mean by "jams" failure to extract? Stovepipe? Double feed? Failure to feed? Need more info.

Generally adding a suppressor will increase gas pressure.

If i had to guess it's probably some sort of feeding issue? The bolt is cycling faster because of the extra gas from the suppressor and the magazine can't push up a round fast enough. That's my guess.

s4s4u · April 20, 2025, 12:11 AM

Quote:

What do you mean by "jams" failure to extract? Stovepipe? Double feed? Failure to feed? Need more info.

All of this ^^^

Jam is for toast or bagels. Please define the failure?!?

FrankenMauser · April 20, 2025, 02:58 AM

More information please.

But, I will take the time now to ask when it was last cleaned and how many shots were fired suppressed (regardless of how well it functioned).

Double Naught Spy · April 20, 2025, 09:08 AM

With most suppressors, you will experience additional back pressure which will change the speed at which your BCG cycles, hence throwing off the timing, resulting in your malfunctions.

The Happy kaboomer · April 21, 2025, 10:54 PM

I recently bought a Bear Creek upper in 7.62x39. Once I had built the lower. I put a digital night sight and Griffin Armament suppressor on it....It has run flawlessly......I get some gas back in the action but that's to be expected with the can.

FrankenMauser · April 22, 2025, 04:31 AM

Prior to this post, Mosol's last visit was in January.
So we should probably expect him to come back in July.

April 17, 2025, 11:58 PM	#1
Mosol Junior Member Join Date: January 22, 2013 Posts: 2	AR suppressor problem Im trying to figure out why an AR in 7.62x39 operates fine when unsuppressed but jams every shot or every second shot when firing suppressed? Firing from a 16” barrel using a SilencerCo Omega300 is the rifle with suppressor on not getting enough gas to operate correctly or maybe getting to much gas and failing to operate correctly? Any ideas? Thanks ahead of time.

April 18, 2025, 06:06 AM	#2
Shadow9mm Senior Member Join Date: March 21, 2012 Location: Indianapolis, IN Posts: 4,576	What do you mean by "jams" failure to extract? Stovepipe? Double feed? Failure to feed? Need more info. Generally adding a suppressor will increase gas pressure. If i had to guess it's probably some sort of feeding issue? The bolt is cycling faster because of the extra gas from the suppressor and the magazine can't push up a round fast enough. That's my guess. __________________ I don't believe in "range fodder" that is why I reload. Last edited by Shadow9mm; April 18, 2025 at 06:12 AM.

April 20, 2025, 02:58 AM	#4
FrankenMauser Senior Member Join Date: August 26, 2008 Location: In the valley above the plain Posts: 13,753	More information please. But, I will take the time now to ask when it was last cleaned and how many shots were fired suppressed (regardless of how well it functioned). __________________ -Unwilling Range Officer -Unwilling Match Designer -NRL22/PRS22/PRO -Something about broccoli and carrots

April 20, 2025, 09:08 AM	#5
Double Naught Spy Senior Member Join Date: January 8, 2001 Location: Forestburg, Montague Cnty, TX Posts: 12,787	With most suppressors, you will experience additional back pressure which will change the speed at which your BCG cycles, hence throwing off the timing, resulting in your malfunctions. __________________ "If you look through your scope and see your shoe, aim higher." -- said to me by my 11 year old daughter before going out for hogs 8/13/2011 My Hunting Videos https://www.youtube.com/user/HornHillRange

April 22, 2025, 04:31 AM	#7
FrankenMauser Senior Member Join Date: August 26, 2008 Location: In the valley above the plain Posts: 13,753	Prior to this post, Mosol's last visit was in January. So we should probably expect him to come back in July. __________________ -Unwilling Range Officer -Unwilling Match Designer -NRL22/PRS22/PRO -Something about broccoli and carrots

April 21, 2025, 10:54 PM	#6
The Happy kaboomer Senior Member Join Date: October 14, 2009 Posts: 286	I recently bought a Bear Creek upper in 7.62x39. Once I had built the lower. I put a digital night sight and Griffin Armament suppressor on it....It has run flawlessly......I get some gas back in the action but that's to be expected with the can.

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