if i were to try that i'd use finer than 800grit... try (if you're willing to take it apart) cleaning all the trigger parts really well, putting them back together, and lubing them up. and make sure the two springs aren't switched too.

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Proud Canadian Baller
Kit: A5, camo job, polished internals, 14" Smart Parts Progressive barrel. Borrowed Opsgear G36 stock. 24oz CO2 w/ remote and slide check. Neat homemade sling. MORE TO COME
Vents Goggles and Multicam