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Hi, guys on the web there's is a types of buckings for vsr's, ones said gbb bucking rubber and others said only bucking rubber, the two of them are ver bucking but i don't know if there's is a difference between them, can I use a gbb bucking on a spring sniper?. Another thing, do you think if I design a piston complete madre of steel with a good slim shape con the back but a little more heavy on the front will produce more kinnetic power?