Next change, I removed the rifle extension/stock from my ArmaLite lower and put on a PSA carbine tube/H buffer I had in the closet. And an old ACS stock. The BCG pictured is ArmaLite but hopefully the BCM unit will get here tomorrow via Priority Mail.
(Edit: BCG came in today. Adjusted the total weight up 1/2 oz due to BCM's M16 carrier over ArmaLite's semiauto carrier.)
Here she is, another nice KISS rifle.
Total weight as pictured (except for the Lancer magazine) is 7# 2.0oz.
Losing the full carry handle for an MBUS2 would drop 8oz but for now I like the look.
And here's the parts list so far:
ArmaLite M15 Stripped Lower
ArmaLite Lower Parts Kit
PSA M4 Milspec Receiver Extension Kit/H-buffer
Magpul ACS stock
PSA 16” Midlength 1:7 light government profile
BCM M16 Bolt Carrier Group
Daniel Defense Charging Handle
Colt A4 Carry Handle (Cardinal Forge)
I have about $800 in the rifle.