It weighs about 10.8kg (or 23.8lbs) on my personel scale..
Here are the spec's as it is now:
Frame: Mongoose/AMP B2
Fork: AMP F2
Headset: Chris King ahaed 1 1/8”
Stem: Ringlé 135 x 0°
Handlebar: Answer Hyperlite
Grips: ODI mushroom
Brakes: XTR M900 with original brake pads
Brake booster: Curve
Brake/shift Levers: XTR M900
Front Derailleur: XTR M901
Rear Derailleur: XTR M900
Derailleur/brake lines: Jagwire L3 in chrome to match (I know it’s not vintage, but it also has to work nicely)
Cassette: XTR M950 11-30 (still didn't find a first gen M900)
Chain: shimano HG91
Cranks: XTR M900
Chainrings: XTR M900 except the large one (maybe XT ??)
Bottom Bracket: UN91 68x107 (still have to find a ti 105-107)
Pedals: Onza HO Ti
Hub Skewers: Ringlé CamTwist
Hubs: White Industries
Rims: Matrix Voodoo 32h
Spokes: Wheelsmith 2.0 - 1.5
Tubes: Air B
Tyres: Ritchey Z-max WCS 1.9
Saddle: Flite Ti
Seatpost: Ringlé Moby
Bottle Cage: Specialized (have to find a nice Ringlé H2O)
Next thing I'm up to is replacing all the standard bolts for aluminium ones and a few titanium (where needed) to drop the weight about 100-150gr...
And maybe respoke the wheels to some Matrix Mt. Aero (light, but tricky with brake pads) to get it even more 1992 and shave of some extra gramms...
Don't know yet if I really want to get lightweight, but as I'm writing this, I think it shouldn't be any problem to hit the 23 or even lower with period correct retroparts...
...but for now... it's a rider...