Suppressors POI shift experiment with suppressors

[Ape_Factory]

Had a few experiments lined up and one of them was to see what sort of POI shift I'd get by removal and reattachment of the suppressor on my 308 bolt rifle. I took it a bit further and not only did that but added a second suppressor into the mix. Short answer, really no significant shift. The wind likely had a far greater effect than removing and attaching the suppressor.

I took three shots on the left target, suppressor on. I removed and re-installed the suppressor and shot three more on the right target. Should have kept the same target but I wasn't sure I'd remember which shot was which. I then took off the first suppressor and installed the second suppressor, same right target.

Suppressor 1 was the Diligent Defense Enticer S
Suppressor 2 was the Huxwrx Flow 762
Muzzle device was the Huxwrx muzzle brake
The Diligent Defense has the new Huxwrx HUB QD mount installed

First three shots with the DD (blue)


Rest of the shots, right target. DD is blue, Huxwrx is yellow. Winds were gusting north of 15mph at times.


I was surprised the shift, if any, was so small, especially between the two suppressors. I've always liked the Huxwrx mounts and even their new HUB mount is stupid easy to attach and remove. It's not the lightest at around 4oz. but the extra weight doesn't seem to be affecting accuracy at all.

 

[Bluedog82]

Most quality cans and mounts these days exhibit minimal POI shift. Thanks for posting this!

 

[KYAggie]

For grins you should find someone with a AAC7.62SD with a 51T mount and repeat the experiment. My guess is the POI will be different every time you mount the suppressor an likely not minute of human at 100 yards.

 

[ZA206]

I ran the same experiment with my 24” 6.5CM Proof CF barreled Aero AR10…
AAC SDN6 that’s been Ecco’d with a Keymo HUB mount & Silencerco SAKER with a Keymo HUB mount.
Basically 1.3 MIL shift down for the SAKER and 1.7-ish MILS for the SDN6!!!

Tested using 143 Norma, 140 ELDM & 147 ELDM factory ammo… the black sharpie cross is the POA.

 

[ZA206]

The SDN6 is a PIG!!!

 

[KYAggie]

I ran the same experiment with my 24” 6.5CM Proof CF barreled Aero AR10…
AAC SDN6 that’s been Ecco’d with a Keymo HUB mount & Silencerco SAKER with a Keymo HUB mount.
Basically 1.3 MIL shift down for the SAKER and 1.7-ish MILS for the SDN6!!!

Tested using 143 Norma, 140 ELDM & 147 ELDM factory ammo… the black sharpie cross is the POA.



View attachment 8366371

Interesting. I had my 7.62SD Ecco’d with the A419 Hellfire mount and it’s repeatably 1.3 MILS down with the suppressor on vs the brake. That was with a AR10 16” Faxon Gunner weight 308 barrel. Your results are very similar.

 

[flyboy]

Just had the REM Sps 308 threaded and ACR mount installed over the winter. Took it out today for the first time.

With a SC Omega 36M I zeroed the rifle. It did pretty well, right at MOA but I was not on my game and kept throwing shots. Did three 5 shot groups all about or a little over MOA. Removed the can to see how the ASR brake worked (not bad for a suppressor mount). I had to adjust about 1 MOA up and .75 right without the can. I remounted the can. Shots were now 3.5 low and 2 left. After returning the scope the the previous suppressed zero. I broke the can loose and reseated it and it moved again to a different spot.

I expected a shift but was hoping for some consistency. Am I missing something? I don’t remember having this problem on my tikka 260 with this same kind of mount.

 

[Terry Cross]

Some are posting in this thread about their POI change with versus without suppressor.

I don't think that is what the OP was testing.
If I'm interpreting his post correctly, he was testing the POI shift after removing and reinstalling the suppressor. Basically, does the mount repeat well.

He can correct me if I'm wrong on this.

 

[flyboy]

Sorry if you were referring to me. I kinda did both. My shifted with both. Wish it hadn’t.

 

[Yondering]

Just had the REM Sps 308 threaded and ACR mount installed over the winter. Took it out today for the first time.

With a SC Omega 36M I zeroed the rifle. It did pretty well, right at MOA but I was not on my game and kept throwing shots. Did three 5 shot groups all about or a little over MOA. Removed the can to see how the ASR brake worked (not bad for a suppressor mount). I had to adjust about 1 MOA up and .75 right without the can. I remounted the can. Shots were now 3.5 low and 2 left. After returning the scope the the previous suppressed zero. I broke the can loose and reseated it and it moved again to a different spot.

I expected a shift but was hoping for some consistency. Am I missing something? I don’t remember having this problem on my tikka 260 with this same kind of mount.

What you're describing indicates a consistency issue with the mount. Maybe it's nasty with fouling, or maybe alignment isn't very good and/or the mount isn't locking up consistently.

With a decent mount that locks up the same way every time, there should be no change in POI if you pull the suppressor off and reinstall it, as the OP described. If there is, your mount system has issues.

The key part of the statement above is "locks up the same way every time", meaning the same way a direct thread mount does - where the suppressor is always clocked the same way, and aligned the same way. A 3 lug mount is a common example of a mount that doesn't do that; the suppressor can be clocked to 3 different positions, and POI with some suppressors will vary between each clocking. Some flash hider suppressor mounts used 2 or 3 start threads too, with similar results. Others just didn't lock up solidly and repeatably, meaning a potentially different POI every time the can is mounted. IMO, avoid those kinds of mounts; it's just unnecessary headache. There's no reason a good QD mount can't lock up consistently every time.


And of course as Terry Cross pointed out, some people seem to be talking about change in POI with the suppressor mounted vs not. There will almost always be a change in POI with and without the suppressor - adding weight to the end of a barrel does that. But if the mount is solid and repeatable, that POI change should always be predictable for a particular suppressor.