The other sillier option is to just build it as a SAM-R/SDMR type - leave the existing barrel, free float it (LT, DD, C4 12"+ handguard) and go from there. The 13" or 15" TROY or TROY/VTAC rails are also a good value proposition.
If you're not running it suppressed, I'd spend money on the trigger and stocking 262 or similar match ammo before being that worried about the barrel, but the WOA barrels are great starting points if you do decide to go that route.
عندما تصبح الأسلحة محظورة, قد يملكون حظرون عندهم فقط
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Semper Fi
"Being able to do the basics, on demand, takes practice. " - Sinister
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