Suppressors Suppressor Q's? POI shift, etc.

[GUNNER75]

Posted something along these lines some time ago, but have further testing with my first suppressors owned.

Test rifles:
Custom Stiller Tac 30, Bartlien Barrel, 243.
AR10T Cut down to 20" and threaded by GA.
(Both guns shoot very very well w/o can, and equally with. POI shift is less than 1" by far at 100yrds. Need to test these on out, but they hold zero at whatever range out to 600yrds.

AR15 OLY LTF Upper (factory threaded)
AR15 S&W 16" Flattop.
Had to shim OLY LTF Upper rifle .020 to get POI change below 3/4" and have to tighten suppressor snug, not just spinning on and light hand torque, almost strap wrench tight. W/o shim on OLY, the POI is like 2' low, 11" left.
S&W tested less, but much worse, no shims added due to time restraint.

Suppressors:
Karma 5 .223 TS
Karma 7 .308 TS

This is my question, does the factory tube/threaded rifles tend to toss POI off due to thread to bore alignment? I am very very certain that the .223 can on a custom barrel, threaded right would be very very little POI shift.

FWIW, TS suppressors are pretty darn impressive. Shot next to some others and not only me, but they were very impressed with them. There was almost every suppressor brand on the line.

 

[Conqueror]

Re: Suppressor Q's? POI shift, etc.

You may be "very very" certain, but I'm not. The simple act of hanging a 1lb+ weight on the end of the barrel will induce some shift. It also alters the harmonics, which can induce shift, and the design of the baffles themselves may induce shift too. There's never really a good way to get zero POI shift. If you do, you've gotten lucky. A shorter, stiffer barrel will help, as will a perfectly concentric thread job, but none of those are guarantees.