I have this Maccari Ultra Mag spring, I bought it to tune my Super Streak but it turned out to be the wrong size, can't sell it so I'm considering buying a 350 to tune in the future ( make use of the darn spring )But with all this,...I think is Melik tuned B28 ? the 350 clones right ?I'm thinking I should get one of them and have a spare spring for the future,...Am I thinking along the right lines, does that spring fit them guns ?ThanksM