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The gun, from the upgrades iv done, has been 100% TM compatible. If you can find an MP5 tm Hop up unit, a metal one preferably, it should fit.. all I have done is put in a 6.04 mm tight bore that is about an inch and a half longer than the stock barrel, a gaurder rubber hop up and switched the stock spring for a madbull m100 spring. The spring will lower the fps but I have found that my gun shoots farther and more accurratly after I did this with. This is just what I have done and it works well for me.
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