aldar,
I have sanded, ground, and filed just about everything else on the market at one time or another, but no, I've never done lams and am considering doing the same myself shortly, so I'll be interested in the replies. I'm sure that someone on here has. And then again you can always call GSI and ask them about doing it (even if you don't have their stock, which I'm going to order with Santa-$, but will re-shape a bit anyway - schnable forearm with straight grip butt stock).
...I did want to say to...
Larry,
That's a nice looking rig. Caliber and BBL length...?
Doc