This expert-level review of the Colt 6520 16" pencil barrel provides detailed technical analysis and performance data. The barrel, dated September 2003, features a chrome-lined bore, 1:7 twist, and hand-finished feed ramps. Testing with various ammunition types at 100 yards reveals its accuracy potential, with a 30-shot group of 2.123 MOA using Federal 77gr MatchKing and 3.449 MOA with PMC M855. The review also explores the impact of barrel nut torque on accuracy.
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