HUH?.... Must be something I haven't seen....fancy adjustable combs that slide over that condor tank
Having a separate lower block would interfere with the grip, so then you have to move it back, necessitating too long a LOP.... I haven't come up with a good solution yet....
For the RVA, instead of a separate cap on your design, why not just use a screw big enough for the hammer spring to pass through the threads?.... On my 22XX RVAs I use a 3/8-16NC (could use a -24NF) and the 5/16" hammer spring slides right out by just removing the adjusting screw.... I'll probably be changing over to a 7/16" to accomodate a larger hammer spring diam. on the Hayabusa....
Bob