weirdest thing last night happened while building a buddys 18" rifle length SPR... I definitely am not new to building AR style rifles.last night once we got the rifle all together,we went to put the BCG and Raptor handle in and the bolt would not lock into the barrel lugs... gun would not go into battery. after about 10 min of head scratching we found that his gas tube measured 15.5" when it should be 15" (IIRC) not allowing the BCG to go into battery. Am I crazy? could this just be a "well these things are mass produced and one coulda slipped thru QC?" have any of you guys ran into too long of gas tube? its a tube that he ordered from raineer. i guess at this point its time to drive to curts and see if they have one in stock and deal with raineer later.