Hitting a steady 15bps without shootdown maybe pushing it with the classic but it should easily hit 10+
I've seen 13bps on my own Egomag running a classic level 7
It's the slower recharge time on the regulator that holds them back. This was sorted on later Emag, RT Pro and X valves - which can cycle at over 20bps
All depends on How much you want to spend
I can make rails and do all the machine work would need a sear and a donor frame and noid i have a couple of lprs left over and maybe a ram