If you want consistency, then add a bearing spring guide and a new hopup rubber. That combined with the tightbore will get you some pretty consistent shots. Also, consider adding a sorbo pad to protect your mechbox. Those weak mechbox shells don't generally survive very long shooting at those velocities. And while you're in the mechbox, install some metal bushings (no ball bearing - just standard metal bushings) and clean and reshim the gears. That should give you a reliable and consistent gun.
__________________
|