watch that dude, explains the whole concept of boost technology. As for the bolt I would keep it stock, if your looking to upgrade get a virtue board, pricey but worth it. Bolts really dont make that much difference on A pmr, the guns dynamics are not really set out like the invert mini for example, boost technology is the PMR's key.
About the bolt anyway, keep stock, or if you have a gun that would look cool with orange
get an orange
bolt, wouldn't mak much difference though