FYI, the new SileNZ carbine or subsonic suppressors will fit an M4 profile barrel and locate the rear bushing to contact just on the front edge of that step down on the barrel. Good hybrid alloy units, and provided you arent doint mag dumps they will give good service. (Like any alloy suppressor you have to take care not to over-cook them.) Available from GunsNZ.com or me. Gunsnz have them with bushings all ready to go for the stag arms AR barrels. Cheers.
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