I have a CWA pistol with Chet's two port comp. Dot never leaves the screen. Love the gun and the comp but not the lead buildup in the comp. My solution for lead buildup is to use Frog Lube green paste regularly and liberally. Makes the lead buildup way less and clean-up a lot easier. First match I shot with the gun the RO commented about fire coming from the comp. I just smiled.
Whichever comp you get my advice is, before shooting the comp, coat the inside liberally with a good cleaner/lube to season the comp.