Picatinny - what does it weigh ?

[Breacher]

My LMT 308sp is heavy. I dont mind a heavy rifle and most of the weight is to the rear which is fine.

 

I am swapping the steel nightforce rings for nightforce ultralite rings. Then I got to thinking about the picatinny rails.........

 

I use a couple of inches of the top one and never use the rest. Thats 69 bits of metal all up front not being used and adding weight just where I dont want it.

 

Just wondered if any of you guys had machined away picatinny rails and how much weight you saved per slot removed ( if you made a note )

 

Also considering fluting or dimpling the barrel - any idea how much weight I would lose by doing that ?