9mm AR Assembly

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So it begins...



Yeah, why not start with a Colt upper receiver?

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Update...
Here's a pieced-together look at the 9mm carbine project so far:



I ended up going with a Hahn mag block, MI FF rifle handguard, Magpul BUIS, Aimpont 2x, Streamlight TLR-1... just need a few more bits and pieces before I tighten everything up and finish it. Sitting on my rifle lower featuring KNS pins, Timney trigger, increased-power buffer spring, etc.
Will have it ready for the upcoming Barstow Supersecret shoot...