Need advice on FF Handguard for my 7.5" AR Build

Hey Fenceline, I just received my XB1 finally today and have a quick question. It didn't come with a crush washer or anything of the sort, what did you use when you mounted yours? Also how did you get the correct timing of the XB1 on the barrel so the lettering was on the side?
And finally, since I'm going to be comparing results of the XB1 and the DPMS Levang, is it ok to just thread each comp on for testing without tightening completely, and then after making my decision installing the one I decide on appropriately?
 
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