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I have opportunity to buy a rebuild kit for my Daisy 747 that uses polyurethane & teflon seals. Has anyone used one of these kits ? If you have, was the performance on a par with an O.E.M. parts rebuild when you were done? It looks pretty slick but I wonder if the claim "once & done" is...

I have been using a 747 as a practice tool for RF Bullseye this winter and have developed a real appreciation for this air gun. I had to rebuild the pneumatics just recently and wondered if the air valve would last longer if it was in contact with the seat of if it would be better left in the...