Issue with shooting suppressed

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Issue with shooting suppressed

Postby Mossyrocks » Sun Oct 26, 2014 2:54 pm

Im shooting a 20" Repr with the 2 position block and an AAC 762SDN-6. With the block set to suppressed Im getting 1:00 ejections the are actually hitting the handguard. Anyone else have this problem with this can? I would say a longer can would have enough back pressure to keep from under gassing.

Here is the brass from suppressed and un-suppressed. One round has stovepiped so far but they all have that same dent where the bolt carrier slammed it into the ejection port.

Image

Suppressed on left.

Image
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Re: Issue with shooting suppressed

Postby AGBM » Mon Oct 27, 2014 10:06 am

I would contact LWRC, see what they think.
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Re: Issue with shooting suppressed

Postby Light1984 » Mon Oct 27, 2014 12:22 pm

Definitely call LWRC, but my guess is your gun is over gassed, not under gassed. The bolt is moving back so quickly that the rounds are bouncing forward at 1:00 off the deflector. That's also why the case mouths are dented. You may look into a heavier buffer spring and/or buffer. Definitely call LWRC though. It would be better if it was under gassed (ejecting at 4-6 o'clock) because they could just ream out the suppressed port on the gas block selector. They may be able to give you a new selector for the gas block that has a smaller hole on the suppressed setting though which would save you from having to mess with the buffer system, worth asking for anyways.
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Re: Issue with shooting suppressed

Postby bastardsonofelvis » Mon Oct 27, 2014 1:07 pm

^This sounds about right. Give them a shout.
Try not. Do. Or do not. There is no try. -Yoda
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Re: Issue with shooting suppressed

Postby Mossyrocks » Mon Oct 27, 2014 7:26 pm

Light1984 wrote:Definitely call LWRC, but my guess is your gun is over gassed, not under gassed. The bolt is moving back so quickly that the rounds are bouncing forward at 1:00 off the deflector. That's also why the case mouths are dented. You may look into a heavier buffer spring and/or buffer. Definitely call LWRC though. It would be better if it was under gassed (ejecting at 4-6 o'clock) because they could just ream out the suppressed port on the gas block selector. They may be able to give you a new selector for the gas block that has a smaller hole on the suppressed setting though which would save you from having to mess with the buffer system, worth asking for anyways.


I see what your saying but it doesnt feel over gassed. It feels weak to me and more like the cases arent totally ejecting. If I keep the can on and turn the block to normal then it definitely over gasses and puts the rounds at about 4-5:00 and double fired once. Im going to call tomorrow if I get time, just hope I dont have to send it to the mothership.
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Re: Issue with shooting suppressed

Postby bastardsonofelvis » Mon Oct 27, 2014 10:46 pm

Double fired!? I hope you have a stamp for that weapon, son!
Try not. Do. Or do not. There is no try. -Yoda
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Re: Issue with shooting suppressed

Postby Mossyrocks » Mon Oct 27, 2014 10:53 pm

bastardsonofelvis wrote:Double fired!? I hope you have a stamp for that weapon, son!


I have quite a few stamps but not one that fun! A little bolt bounce never hurt anyone... Haha. However, back to suppressed she went.
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Re: Issue with shooting suppressed

Postby Mossyrocks » Fri Oct 31, 2014 10:43 pm

Sending it back to Lwrc monday morning, I'll update with the cause and fix if anyone cares to know.

By the way, I have had to work with Lwrc before and its always a pleasure. Great people, great service, you get what you pay for.
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Re: Issue with shooting suppressed

Postby AGBM » Mon Dec 01, 2014 7:34 am

Did LWRC get it resolved? What did they do?
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Re: Issue with shooting suppressed

Postby Mossyrocks » Mon Dec 01, 2014 7:52 am

AGBM wrote:Did LWRC get it resolved? What did they do?


They have it right now, I'll update when I get it back.
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Re: Issue with shooting suppressed

Postby Mossyrocks » Fri Dec 12, 2014 7:55 am

Got my Repr back yesterday, the repair notes said it was under-gassed causing short stroking so they tuned it to my SDN-6. Im hoping to get it out saturday morning and see how she does.

Eta: Im betting since it wasn't greatly under gassed that a full size suppressor would have had the correct back pressure for it.
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Re: Issue with shooting suppressed

Postby Mossyrocks » Sat Dec 13, 2014 1:07 pm

Success!

Image

And pic of said Repr... Just because.

Image
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Re: Issue with shooting suppressed

Postby A5scott » Sun Feb 28, 2016 10:31 pm

Hey, Sorry if I missed it, but what did LWRC do to tune it to your can?

thanks,
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Re: Issue with shooting suppressed

Postby Mossyrocks » Mon Feb 29, 2016 9:22 am

They just enlarged the gas port until it had a good ejection pattern with my can.
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Re: Issue with shooting suppressed

Postby A5scott » Mon Feb 29, 2016 1:06 pm

Ok cool, thanks

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