Actually, now that you mention it. I have found quite a few spiders or evidence of spiders (the Yellow Sack Spider) in the bores of old guns that people have brought to me for cleaning over the years. I opened a 20 gauge single shot one time and peered down the bore with my light and saw an enormous wolf spider in there so I stepped out to the back porch and evicted him with a load of No. 8 shot (overkill, I know).