no doubt someone has already asked/answered this but what is with the o-ring on AC thread barrels? is it to secure the barrel or what?
also, while i remember. when attaching my barrel to my ETEK, is it ment to screw in flush to the marker or is there ment to have a tiny gap? (first time using it
)
also, while i remember. when attaching my barrel to my ETEK, is it ment to screw in flush to the marker or is there ment to have a tiny gap? (first time using it
)