only thing i upgraded other than barrel was to a eg 1000 motor just for the name behind it this guns ris movment is the same as a TM sr-16's movement but and most tms have barrel whobble also, its not so bad that i would fret over how to super glue or weld this shit together, its good and the whobble is not worth paying attention to, get a ris grip on this for a half tripod half accuracy guider half qu