Not many use a full length metal rail any more. Plenty of key mod stuff out there that is lighter. I'm still in the just spend the money to get the SBR camp. I've dealt with ATF and don't want to be questioned. Already have a trust set up and ready to do suppressors now also.
I was actually referring to the small length of picatinny added to the bottom of the buffer saddle to mount the sling disconnect.
But while I'm here... what would be a good light recommendation for a keymod cover, just to mount an AFG an =d a TLR-1? This Keymod stuff is new since last time I was in the AR game.