Well it's much heavier than the factory plastic stock but not that noticeable between the Boyd's thumbhole. I'm sure the LSS-XL would add a little weight in addition to what I have. This is a model 11 in .308 with 20" medium contour barrel. The whole rig as you see it is about 10.5-11 lbs (bathroom scale isn't that accurate). I am looking into an aftermarket barrel in the 24" range now and it would be nice to push that bipod out farther especially with more barrel out in front of it. Thanks for the compliment. It's been a bit of a project, but I am happy with it now.