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Sounds to me to be a 6721
they are a flat top 1-9 twist 16" HBar
serial number prefix shoul start with BD
A call to Colt with the serial # will verify the model and age
Colt AR-15A3 Tactical Carbine, Model 6721
Posts by mvician
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Sounds to me to be a 6721
they are a flat top 1-9 twist 16" HBar
serial number prefix shoul start with BD
A call to Colt with the serial # will verify the model and age
Colt AR-15A3 Tactical Carbine, Model 6721
1 - 1 of 1 Posts
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