Question for the guys runnin' the B&T M4 Handguard

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How tight should that set screw be tightened? Do you tighten it only until the clearance between the barrel and handguard is removed, or do you tighten it down firmly?

thx
 
For anyone who might be interested I got a reply from B&T.

They said "Tighten the set-screw to remove clearance and then ¼ turn more to make sure there is no play."
 
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