Originally Posted by
junglie
A good tip with the rb is to unwind the restricter grub screw in the tranfer port roller breech, you will have to heat it first as they are locktighted, then you will have to cut the mainspring down a coil or two & re-finish it,after chronoing it obviously. This gives a much sweeter firing cycle & makes them easier to cock too, making extended zeroing or plinking sessions even better.