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The instructions say to use the spacer but I've seen ok here and other forums conflicting posts about surefire saying to not use it on SCAR barrels. I just installed one on my 16 and used the spacer and shims to time it correctly did the install with a geissele alignment rod so it's not canted at all should I be ok?
 

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The SCAR16 shoulder on the barrel is OK, it's on the SCAR17 barrel profile that usually is the problem. On the SCAR16 you should be fine.
 
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