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POI Shift, the long and short of it

Posted: Mon Dec 15, 2014 5:09 pm
by quiettime
Still new to the suppressor world.

In your experience, would you say POI shift will be less with a shorter barrel? About the same?

Re: POI Shift, the long and short of it

Posted: Mon Dec 15, 2014 8:41 pm
by dark2023
I'll piggy back on this thread if you dont mind.

Can someone please explain exactly WHY suppressors change the POI?

Re: POI Shift, the long and short of it

Posted: Mon Dec 15, 2014 10:25 pm
by curtistactical
The two main reasons are:
Harmonics>The added weight on the barrel will change the harmonics of the barrel causing the shift but usually settles it down some so accuracy increases.
Non symmetrical porting>This usually happens on the lower velocity rounds from my experience with rimfires being the worst I believe because of bullet weight. The gas crosses the path of the bullet affecting the bullet path. Suppressor design will have a huge effect on this.
There are other reasons for POI shift but I found they are usually accompanied by poor accuracy as well such as suppressor mating surface.

Re: POI Shift, the long and short of it

Posted: Tue Dec 16, 2014 6:21 pm
by quiettime
so would you say then barrel length is a factor or not so much?

Re: POI Shift, the long and short of it

Posted: Tue Dec 16, 2014 9:04 pm
by a_canadian
Well barrel length and thickness relative to suppressor mass would undoubtedly be a factor. But of course every length/diameter/calibre is going to follow gravity differently, with a wide range of flexibility among barrels. Add in the range of weights for suppressors, between a few ounces and a few pounds, and you have a bit of a dog's breakfast of variables. So the short answer is yes, barrel length is a factor. As is everything else. Wishful thinking doesn't prevent a long and/or flexible barrel from drooping with a heavy can out front.