Brownell's carries quite a few on their website. Numrich Gun Parts carries a lot of older and obsolete firearms on theirs. i have used both for many of my firearms. another source is the manufacteror themselves. most of the firearms i own that have owners manuals have exploded views of the firearm with a parts list and sometime even the part numbers.Where would I get disassembly instructions for any firearm that I buy including trigger schematics?