nothing to the gun but i would recommend some rechargeable batteries
this gun is basically an electric cocker, through the software you can program the BPS, the dwell for the hammer release, hammer drive, bolt release and bolt drive. the gun does need to broken in with 2-4 cases(thats just fun though)
to put it simply its a the trajectory of a cokcer with the speed and comfort of an angel. the service at splat attack has been super
Ive been hearing about battery problems with the xcal but have not experienced them myself. I played the last three weekends plus alot of shooting in the backyard and my batt is ok. these are typical problems of a new gun on the market, some will have problems others dont.
a solid marker shoots straight fast and is everthig you pay for