Please bare with me I have a few newbie questions. I wish this site had a section for newbies like me 1) What are the different parts and what do they do? I've heard of the bore, upper, receiver and a few others that I've forgotten, but could someone make a list please? I've looked other places but I haven't been able to find a complete list. 2) Slides are only on pistols right? 3) What is pitting? Are they just dents or is it a hole in the metal because it rusted out? Thanks for any input.