Not the best picture but I've only just set it up. Challenge for FT and LG for HFT. I shoot in the SWEFTA league so HFT is out to 55yds hence riser rails on both rifles. What I will actually do is just swap the scopes (as I did when I just had the LG) and shoot them both for a while. I'm not really expecting any difference. The only thing I've noticed so far is a slight change in the moulding of the trigger guard and the location of the tuning screw is set slightly further back on the Challenge. The accessory rail runs the full length except on the electronic version. The rear stock does seem to be the major change but I didn't get that on my spec, TBH I was already happy with the fit as it was although I wouldn't knock it as an improvement.