Just curious but what barrel did you purchase and what type of build are you doing?
I went with an 18 inch Daniel Defence from S&J Harware. It's a match chamber 5.56 in their S2W(strenght to weight) profile which I'm guessing is designed to be a compromise between a heavy barrel and government profile. It came with the gas block installed. It's my first build and I wanted it to be a target/spr/dmr kinda hodgepodge, but I want to see just how accurate I can make it while keeping the budget reasonable.
Blue Line Stripped Lower - $150
S&J Hardware LPK - $100
DPMS Low Pro Competition Upper Receiver - $89
Ice Arms Gen 2 Phosphate BCG -$150
Daniel Defence Standard Charging Handle - $30 (off the EE)
Magpul MOE Fixed Stock Kit $100
Daniel Defence 18 inch Barrel with Gas Block $385
Still need to order a gas tube, flash suppressor, free float tube (haven't decided on which one yet) and glass/mount, thinking of going with the Bushnell Elite Tactical fixed 10X, supposed to be decent and falls withing my price point and build style. Also need some assembly tools and I might splurge and send the receivers and front handguard for sand blasting so I can duracoat/cerakote them in a different colour.
Barrel was definitely the priciest single part but everything I've read says you'll never reach a decent level of accuracy without a decent barrel and the DD has good reviews. Probably be winter before I get all the parts and tools and then spring before it shoots for the first time. Between kids, work, budget, not a lot of hobby time.