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So I've done the lower build and enjoyed it no special tools, already had a punch set. But now I'm thinking of building a 300 blk out upper my biggest concern is the gas tube and getting the alignment and position right any tips on that and from what I've read if it's wrong I've basically build a bolt action AR ?
 

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Oil the threads. Tighten and loosen 3 or 4 times. use a #15 drill bit (HSS Aircraft Extension Drill Bit Size 15 x 6 - - Amazon.com and use the drill bit to align the barrel nut and the hole in the upper and do the final tightening. Seat your gas block, then use your carrier / gas key to test alignment and true "free float" of the gas tube. Tighten everything up, test everything again a few times before you put your handguard on, and you should be good to go.
 

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thanks for the advice, just received my handguard KMR15, It comes with it's own barrel nut.
I'm still awaiting gas block, gas tube and BCG from PSA.
 
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