My outdoor rifles are in the 370+ fps range. I've had Guarder clear in them for years now without any issue whatsoever - from tearing, wearing out, or holding BBs. My 350 fps custom MP5 has a guarder clear, and that little bastard could be considered a sniper for the range and accuracy it gets. My 400 fps A&K SAW has stupid range and the only non-stock part in it is the Guarder clear rubber. Tens of thousands of rounds have been put through each of my guns, and I've yet to have to replace one of the rubbers. They do take extra care when installing though because they do tear more easily than other rubbers.
Although now I'm curious about those PDI ones. Next time I need to replace one, I'll try one of those out.
Last edited by Crunchmeister; November 4th, 2011 at 13:51..