I can modify your stock bolt to the same specs as a Firebolt,i'll even add a 2nd o ring groove on the tail like the more expensive bolts have for better air efficiency.
Costs £6 all in posted to your door
Also have a stock trigger i'll throw in for you
I have just had my stock bolt customised my Oily & it works great, with the QEV its amazing, running 12/52 Dwell, around 165PSI, its really good, well worth £6.