Thread: Suppressor changing point of impact by inches

Originally Posted by gadgetman

Did your friend centre the work on the bore when he did the threading? Make sure it wasn't centred on the outside of the barrel.

I will check and get back to you.

Originally Posted by 10-Ring

On two .308 rifles, one mine and the other my mate's, the addition of the suppressor changes the POI to about 3" high at 100m. Every other suppressor I've seen lowers the POI. Barrel harmonics I guess.

Originally Posted by chalkeye

Did he indicate off the outside diameter, or the bore? Like @gadgetman, I'm leaning towards this cause

I will check.

Originally Posted by DPT

If the suppressor is slightly off to the bore that should not really make a difference with the point of impact, if the bullet is touching the baffles that will defiantly cause accuracy issues.
My guess is that the rear bush is touching the barrel on one side potentially bending the barrel inside the suppressor, try removing the rear bush and shooting it, before shooting it make sure the suppressor is a nice fit on the barrel thread and is not wobbling around.

The rear bush is touching the barrel pretty uniformly on both barrels I use it on. There's barely any gap between the barrel and bushing.

Ok. Will do. Thanks a lot.

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Originally Posted by Russian 22.

I will check and get back to you.







I will check.



The rear bush is touching the barrel pretty uniformly on both barrels I use it on. There's barely any gap between the barrel and bushing.

Ok. Will do. Thanks a lot.

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We give the bushes clearance, about 0.05mm over size, open it up a little so its not touching the barrel.

Originally Posted by DPT

We give the bushes clearance, about 0.05mm over size, open it up a little so its not touching the barrel.

Sweet. I have a pipe reamer at work I'll use. Or get the engineers to use the lathe.

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