Before I start, I know that I should (1) move out of NY, (2) not comply and/or (3) just buy a Remington 760/7600. However, they are (1) not an option, (2) not what I'm willing to do at this point and (3) not as much fun, respectively. So, with that said, here it is ...
My goal was to make a free-floating, pump operated upper that utilizes as many stock AR parts as possible, thus allowing for the same level of customization. My reasons for this stem largely from the fact that Rochester, which is second only to NYC is trampling on our 2nd Amendment rights, does not allow for more than 5-round magazines in any semi-automatic, centerfire rifle. However, manually-operated (pump, lever, bolt, etc) are allowed the NY-legal 10 rounds (though, .22 tube mags can actually hold more.) Also, being in NY, manually-operated allows me to have "evil" features like a pistol grip, collapsible stock, flash hider, AFG and black paint (just kidding).
Onto the build itself:
Here's a video of some dry running empty and with a 5-round mag of snap caps (haven't put live rounds through it yet.)
Mega 3H Lower
Geissele 13" Mk4 M-Lok (tab modded to fit ASA upper)
ASA Side-Charging Billet Upper
Voodoo 14.5" Gov. Profile Barrel w/ Pinned Manimal
Voodoo Life Coat LPK
ALG Quality Milspec (QMS) Trigger Group
UTG Pro Buffer Tube
JP Silent Captured Spring
MFT Minimalist w/ Paracord Braid
MFT Engage Pistol Grip w/ Largest Panels
Magpul AFG (Gen 1)
Magpul BUIS
The only mods from a standard AR are the custom-made (and at this point, rough prototype) pump carrier (which is keyed to the free floating hand guard and actuated the BCG through a physical op-rod), a milled slot connecting most of the M-Lok openings on the bottom of the rail for the AFG mount to ride in and (soon) a steel gas block mounted backwards forward of the pump carrier's action. Other than that, the parts are all reconfigurable.
I chose the side charger to cycle the bolt when prone or shooting off of a rest. Unfortunately, the op-rod likes the gas key so much that they move together when the side charger is actuated (being non-reciprocating, though, the side charger does not move when the pump is actuated), even though they are not supposed to be connected. I do have the front piece of pic rail to rest it on, however, so I haven't decided if I will fix that problem or not. It does have the advantage of acting as a forward assist this way.
It's taken a lot of playing to figure out the best configuration, so I will eventually make a second carrier, using what I've learned to make it even better. The AFG could also be remade, since I took off more material at the back end than I ended up needing to.