I alredy replaced the whole bolt (cylinder, cylinder head (got one for the hop up chamber)), so maybe it wont break, but, if yes, I hope the the ASPro will replace.Be careful not sand it over 120° or it will slam fire.
I will suggest (as I done) to put a shimmer behind the trigger, in order to shortening(?) the trigger pull.
The M150 airsoftpro's spring is heavily OP, it will provide over 600 fps.
Be careful with it, or it will break your cylinder head.