I have three 30 cal suppressors. A Gemtech Sandstorm, an AAC Mk-13 QD, and a KAC 762 QDC CQB. The Sandstorm is threaded on my wife’s 300 BO SBR. It is so quiet a competition shot-timer won’t reliably pick up shots when held over the shooters shoulder. The quick detach Mk-13 moves between several firearms, but shines when affixed to a LWRC 20” REPR. I get negligible impact shift and it tightens groups with most ammo. With 168gr. LE ammo from Federal or Hornady the REPR is a nicely suppressed marksman’s rifle. The little KAC can has been a huge disappointment. While on a 556 NATO chambered gun a mini suppressor can reduce sound levels to near hearing safe, the high pressure of a 308 or better gun the short KAC can is totally ineffective. It works moderately well on a 300 BO, and provides noticeable (but not hearing safe) sound reduction on a SIG 556R chambered in 7.63x39, but only an expensive flash hider on a 308/7.62 NATO chambered rifle.