been looking for some parts to "upgrade" my '81 sig p6. I can barely find any aftermarket/modified parts (hammers, triggers, mag release, slide stop levers). now with my g23 I have no problem finding parts. i've been on gunbroker, topgunsupply, midwayusa, discountsigparts websites, even the sigsauer website as well. my question is, do other sig models have any parts that are interchangeable? for example, would a trigger from a p220 fit the p6? what about a slide catch lever from a p229? anyone know of a website, forum, thread, or post that has any information on this? thanks in advance.