Today I did some testing with a Daniel Defense WAVE QD suppressor on a Ruger Precision Rifle in 6.5 Creedmoor. After establishing a new 200 yd. zero with the suppressor attached, I removed it and noted the POI shift for the un-suppressed barrel. After re-attaching the can I observed that the POI did not return to where it was before. It had moved approximately .75 moa.
I did some research this afternoon and it seems that some people call this a "wandering zero". There is a post on Snipers Hide in the PRS section that talks about how QD suppressors in general are not as good as direct thread (read repeatable) and therefore not suitable for long range.
Just wondering whether anyone on MGTalk may have experience with this phenomenon? For my next range session I am going to attach the WAVE QD firmly to the mount and lock the ring completely. Note the POI, remove the can, re-install it the same way and then re-check POI. Frankly, if it won't hold a reasonably tight zero I will probably return to the muzzle brake that was on the rifle when I got it. I was able to consistently shoot 1/2 MOA with 120 grain SMK's before I started messing with the WAVE QD stuff.
Overall, I am not that impressed with the DD WAVE QD. It is a cool 3D printed can, but it heats up really quickly and I have tried it now on two different rifles (the other was a FN SCAR 17s) and it did not stand out as an improvement particularly in the accuracy department.