I saw a 24" Lightweight in the store wile on vacation.
It was something special. It fit me well and I liked everything about the way it seemed to point and of course mechanically familliar.
It does have a different magazine end nut. I do not know if extended fit.
Anyone have one or any input? I currently have a M-2 Tac. with 2- rd. factory extension and G.R. sights. It does not suit me as well as the 18 1/2" M-1 s90 I used to shoot with rifle sights , a Kick EEze pad, and factory 9 rd. capacity.