Get some New Designz detents. Much easier on paint and improves accuracy.
Ignore the instructions and put the spring in
BIG END OUTWARD otherwise they will stick. Also make sure the recess for the detents is fully cleaned or once again they will stick.
A new designz trigger is the dog's nackers. fully adjustable and the smoothest pull, thanks to roller bearing pivot.
Some sort of venting on/off valve is also essential. Once again the new designz light weight version is perfect for the job. I use mine with a Smart Parts micro rail, and it looks sweet.
I have not installed a qev but by all accounts it is a good mod without any ill effects.
Check out the new designz web site at
www.newdesignz.com
The cheapest way to get their stuff shipped is through
www.catalystpaintball.com They can ship to the u.k for $10 as opposed to the $50 on the new designz site.
Also a barrel is essential. I use the freak kit from my impulse.
Hope this helps
David