I'm sorry, this is a bit of an apples to oranges compairison. The OP's gun is a Colt. Mine is a used Franken gun.
When I bought it, it was 16" HBAR A3. The lower is Bushmaster. It does not have a sear block.
The upper is of undetermined origin. 3 local 'smiths and a police trainer that I recently showed it to say they don't think its the origional upper. the upper is black in color while the lower is gray. Not being a "fit and finish" guy, I didn't realize this meant anything. The reciever has no marks any of us could see. The barrel was also unmarked except for the "Wilson Combat" on the bottom of the muzzle break. But who knows when that was added. Now its a 14.5 + Phantom lightweight (thanks ADCO).
ETA: By "won't run", I mean it persistantly short strokes. Not every round but several per magazine. It runs like a sewing machine with the origional BCG.


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