Got a question for any AR-15 gurus out there.
I recently put together an AR-15 w/ 22" JP Enterprises barrel, JP modular handguard, Harris bi-pod, Larue Stealth upper, Leoupold 3.5-10x scope. I've put about 200 rds through it and haven't seen better than 5" groups at 100yds (used Hornady 5.56...