Re: TRG bipod issue
Hi Ben
I have an unmodified TRG bipod on my TRG42 chassis, and had a similar issue (not sure if it is same as yours). The scuff marks are caused by the fact that the natural stop for the side-to-side tilt of the TRG bipod is when the rifle barrel presses against the flat sides of the bipod assembly. I found that the marks were cause by general movement of the rifle with the bipod connected.
I solved my problem by sticking some one-side-glued tape on the flat surface of the bipod where the barrel pressed. I used tape that had a bit of sponge in its body. That pretty much solved the problem for me.
Another way to solve it that I have heard of, is to fit an o-ring onto the bipod's swivel mechanism. The o-ring acts as a rubber stop to the rifle's pivot movement in the bipod, and has the added benefit (if you use a nice thick o-ring) of reducing your rifle's side-to-side flop in the bipod (which ex-Harris bipod users don't like about the TRG bipod).
Hope this helps.
Cheers
Jaco