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Some boosters are one piece and some are two piece (not counting the lock rings). The two piece has the orifice plate screwed into the end of the bearing with a lock ring...the one-piece is the bearing and orifice all in one. Both types require a lock ring where they screw into the barrel shroud. If your lock ring is staked in place then leave it as is...if it just slips off then remove it before glass beading.

Photos borrowed from BMGparts.com
One piece


Two Piece
 

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You'll spend more on having an orifice made than just spending $20 for a 30-06 booster...which works on 8mm...please read the converting tutorial on the home page.
 

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I've never seen the screw in orifice...when you get yours out how about post a pic.

I don't know of an M6 flash hider for 308, but many guys run the M6 as is on 308 and it works...others bushing them down.
 
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