I have a Colt AR-15 Sporter Target Model it has a 20" barrel with markings C MP 5.56 NATO 1 / 7, the diameter of the barrel is 0.725" at muzzle. It's a chrome lined barrel and the 1:7 twist is best suited for heavier bullets. I was wondering the value. It has been basically just been test fired. I have a Picatinny base that mounts on the carrying handle (not selling the Holosight) and also have a 3X20 scope (replica of the original Colt). I have swivel mount attachment.
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