Right-click on pic and "open in new tab" to enlarge.
From the top:
601 (still need a dimpled rear takedown pin and working on some replica Green Zinc Phosphate furniture)
604/USAF "M16" (but had to use an XM16E1 receiver)
M16A1
M16A2 w/M203 (has thin profile barrel, might move it back to an A2 barrel)
M16A2 (might swap it to an M16A4 model)
607/GX-5857
629/XM177E2 (I'm keeping the bayo lug!)
610/XM177
727
733 (the *better* gun from "Heat")
M4A1
AR-180 on the side