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sniperlabyo
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Sometime the delrine bushing are over size at the rear of the shroud, there is no oring to seal to prevent blow by. And sometime overly tight then I have to bore them out. When I see a vary loose one that affect the accuracy I install an oring groove on that delrine to seal and aligned the shroud.

if you have no POI issue then it’s ok to have a little blow by—-you can call it a air vent.  For me I’m know to drill vent holes at the end of the shroud.