I grew up learning to shoot on the Lee Enfield IV rifle, and graduated on to the SA80 to go full automatic - well, semi, anyway. If there had been a GM6 Lynx I would have wanted to fire it, but never would have - far too much to play with on a range day!
The GM6 Lynx is a 50 cal semi-automatic anti-material rifle. It is a bullpup, but that is not the interesting part. The barrel reciprocates all the way back. Just watch the video, I could watch this thing shoot over and over again. What a beast;