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I used the Guarder clear rubbers for a few years and love them............ even used them in my 500fps M24, although I'd have to replace the rubber twice per year mind you due to eventual tearing. Currently I have an RH65 in there (rated for up to 400fps, but it's been going for two years now and is still good). Have to get new rubber for both my MP5s, one 330fps and one just under 400fps, and am stuck. Have a bunch of the blue Madbull rubbers but always have a sealing issue with them, massive airleaks with upwards of a 100fps drop, so likely I'd go back to the clears. My only issue with the clear is it's made of silicon and regular maintainance (drop or two of oil in the laoding tube to ensure proper feeding), the rubber ends up absorbing it, and after a year swells then tears. Hehe, last year both my guns had hop up set totally off, yet was at the point I could get 0.28g BBs past 200ft easily............ in my previously set 360fps MP5.
Softer rubber gives you a more supple nub in the barrel, it allows the BB to pass by easier without upsetting it too much. But is more suseptable to damage in higher fps guns.
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