i have a friend who uses and is a huge proponent of the prodonovich guns, and seems to take his share of WSB. i began to research their guns more, and Bill Kitto (who helps make the guns i guess) uses all enclosed tracks. i noticed that riffe also has an enclosed track system optional for the MT series, and i've been curious about it. prodonovich and kitto claim that the enclosed track prevents the shaft from bending with higher power, so you get better accuracy with the increased power to your gun. what are the pros and cons of enclosed tracks as far as any of you have experienced or heard about?