Seeking Low Back Pressure .30cal Can (so many choices)

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GS455​

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36ti's first impressions:

I once shot a half dozen rounds from a buddy’s bolt gun with a popular can from 10 years ago. I think it was a Gen1 RPR. I was blown away with the amount of suppression and have been pining for one ever since. Beyond that I have zero experience firing suppressed. A few months ago, I put out this inquiry for suggestions, and thank you for the responses.

As mentioned I went with the new HUXWRX 36ti in the hopes of getting it my on the 8mm M76 (found a guy that does a custom hub to FH adapter) and M49, optimistic that the newer flow-through design would behave well on them as well as other semi milsurps. This was an interesting experience. I had three hosts to revolve through a few weeks ago. I shot five round groups before and after install and observed peculiar (to me), inconsistent results between rifles:


RPR in .308

• This is a sub MOA gun when I do my part with the ammo it likes (so far best is 168gr FGM)
• When suppressed it’s PoI shifted 3.5” down x 1.5” left and group sixe unchanged.
• Report was a fairly sharp, loud snap but does not ring the ears

RAR in 7.62x39

• This is a 1.25” gun with best performing ammo, so far, being 1970s Rommy surplus :-/
• PoI shift was 2.5” straight up with no drift in windage with no change in group size.
• Report was a pleasant but sharp snap

LAR8 Elite Operator (basically Rock River’s AR10 pattern from 10+ years ago)

• I fired a string with it’s Vortex flash hider and got about 2+” group using XM80 Lake City, 150gr “ball”
• I then fired a string, bare-muzzle (w/o the Smith Ent, “Vortex”that came with it and I got about 1.5” group (THAT was a surprise)
• Next, I fired five rounds with the 36ti and got the same 1.5” group with literally NO PoI shift (huh?)
• Report was quite a loud crack+POW that would almost ring my ear.
• Perhaps not hearing damaging loud for a few rounds BUT not nearly the amount of suppression as the .308 or x39 bolt guns. Is this to be expected? Yes I know to wear "ears" but wanted to "hear" the difference.

All in all, I was pleased with the performance on the two bolt guns. From what I’ve read I believe a traditional baffled can would be even quieter on bolt guns. Yes? Suggestions for after we can buy them less encumbered (fingers crossed)?


Takeaway/questions:

• Is it typical for such a PoI shift with vs. w/o the can.
  • Strange that the .308 RPR would shift down and to the left whereas the x39 RAR would shift straight up. Harmonics of the RR .308's bull barrel seemed to conveniently result in no shift(?)
• While I need to do further testing it’s also interesting/revealing that after all these years the Vortex flash hider unbeknownst to me, may have been hindering accuracy on the LAR8
  • Why no PoI shift on the AR10 ?
• AND why I this semi-auto vs. the bolt guns so much louder. Typical? I assume moving parts and places for gasses/sound to escape?

Thank you for taking to time to review this and offer any contributive insights.