what barrel are you putting it on. I've recently had issues with the Guarder clear and the Madbull Python tight bores. clears were great at the beginning but then got loose and tore. switched to the madbull blue with SCS and bob's your uncle!
also for the install, instead of using lube, you can use spit. so unlike TC, I'd put the rubber on the barrel, spit on the rubber and slowly push it in, then you can do as you please with Rob's mom!
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