According to the email I got from them (posted in the other thread) it's optional. I ordered "with M4 ramps" so we'll see what I get. $129+$12 shipping.
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I finally pulled the trigger on this. I ordered a 16 inch pencil barrel and DD upper with a 7 inch DD lite rail. I am going to use a Colt lower with A1 grip and a std M4 stock. Sights will be the DD rear and DD Aimpoint T-1 mount. Should be pretty light. I will be running a X300 for a light.
Might be able to trim a bit more weight with a 3V light (VTAC mount, E1L Light).
I'm going that route with mine (DD 14.5" Pencil Barrel, VTAC/TROY 9.0-EX Rail, MBUS; Aimpoint H-1 on ADM CO, MOE/CTR Stock)
Just so you know, the T1 ADM CO mount is not light weight.
My T1 ADM CO mount = 4.6oz