the adjustable tailcap on the RPL is the better choice as the keyed cap is always full blast...but it's a pain in use because ya gotta hit this little hole with some kinda little screwdriver then get the little screwdriver lined up with it's slot-a hassel. so i fabbed a little screwdriver from a brolken drill bit and silver soldered a small washer to make a little "retainer flange" took the adjustable cap apart and made a little xtra room inside with a dremel tool and put it back after installing my little screwdriver from the inside so it sticks out the little hole. after assembly i went to the pile and found a nice knob(plasticW/ a threaded brass insert) and since i was too lazy to thread the little screwdrivers end i used JB quick weld. no more fumbling around... nice external adjuster on the end of the cap looks like it came all the way from china that way and works great...much more convienient. i just hope the laser cops don't pop me for defeating one of the factory built required by law safety features! but don't try this unless you have a quiet soul and lotsa patience. i did this between Tattoos today but i bet it took me 5 hours straight time.