Suppressor on 6.5 Grendel

[22BR]

I added a Banish suppressor to my stock 20” PSA upper. I am shooting 123 gr. Hornady SST reloaded rounds at 2450 fps. Are there specific changes that need to be made with the suppressor installed? Different buffer configuration/weight or gas-flow adjustments? What indications should I watch for to determine if the gas-flow needs to be changed?

The gas-block is adjustable but I have not made any adjustments. The POI did change noticeably with the suppressor (5” lower and 2.5” right at 100 yds). I run a brass-catcher so I can’t specifically verify the ejection pattern(s) but without the catcher it throws the brass approximately 8 feet at a 4 o’clock position from a bench position.

Thanks for your input.

 

[LocoGringo]

I assume the brass catcher is attached to the rifle? If so, rather than use that, while at a bench, use a box set up next to the ejection port to catch the brass but also you can verify where the brass is being thrown. It sounds like you know, but wouldn't hurt to check. A suppressor adds weight to the end of the barrel, so it's not surprising that the POI changes. Which Banish do you have? I have a Banish 30 and run the 7" configuration on a 7mm-08. If you use the 9" configuration, you're adding a lot of length and some additional weight to the end. How was the group size?

If the brass is thrown forward of 3 o'clock or you're getting a lot of gas in the face from the ejection port, you will probably need to turn the gas down. The easiest way I know to tune the gas is to turn the block completely off and then start with 2 clicks "open" with 1 round in the magazine. It will fire, but will it lock open on an empty mag? Keep doing that process by opening 1 click more and testing if it locks open. When you get to "locks open", open 1 or 2 more clicks on the gas block and you're good. Now you're using minimal gas to reliably cycle, but not too much to beat the gun up.

 

[TonyAngel]

I'm not Joe pro when it comes to suppressors, but isn't the Banish a flow through (I think the term is) meaning that it shouldn't cause back pressure problems?

In any case, 4:00 sounds good me to. I run mine at 3 - 4:00. What was it doing before without the suppressor?

 

[horsemen61]

I added a Banish suppressor to my stock 20” PSA upper. I am shooting 123 gr. Hornady SST reloaded rounds at 2450 fps. Are there specific changes that need to be made with the suppressor installed? Different buffer configuration/weight or gas-flow adjustments? What indications should I watch for to determine if the gas-flow needs to be changed?

The gas-block is adjustable but I have not made any adjustments. The POI did change noticeably with the suppressor (5” lower and 2.5” right at 100 yds). I run a brass-catcher so I can’t specifically verify the ejection pattern(s) but without the catcher it throws the brass approximately 8 feet at a 4 o’clock position from a bench position.

Thanks for your input.

I run an Tbac Ultra 7 gen II .264 can on my 18 inch PSA Upper in the Grendel I didn’t have to change a thing other than add the muzzle break I needed

 

[22BR]

Thanks for your input. Brass catcher is on the rifle - I ran a few rounds w/o it but will do a few more to verify the pattern. It is a Banish 30 - I tried it in both the full and compact lengths. Grouping was decent in both configurations - slightly better in ‘full.’ Shooting roughly 1.5 MOA with some vertical stringing. I have only run one session of reload testing (w/o suppressor) so I expect more fine-tuning is possible with the components I am using (Benchmark & Hornady).

I like the ‘start from zero’ gas block adjustment and will pursue that. Reference the ejection - it was 4:00/4:30 w/o suppression, I will reconfirm that and compare both configuration.

Appreciate the help - thank you.

 

[greyling22]

Ar's are over gassed even before a suppressor is added. Your gas block can likely be turned down.