UPDATE: Got the problem fixed; turns out I had my hammer spring incorrectly aligned. Guys, This is my first attempt at building an AR lower, or any sort of gunsmithing or digging into the internals of a firearm of any type. I thought I followed the directions carefully with the Geissele SSA trigger (and watched the YouTube video from Bill Geissele), but for the ignorant and first timers like myself, the directions I've found don't go much further than "put the tigger assembly in, then put the hammer assembly in and make sure its springs rest on top of the trigger pin." Somehow, I've messed things up. Seems the hammer isn't engaging with the disconnector, and I don't have any real travel in the trigger to speak of at all. I'm really, really lost here guys. Do any of these photos show something obvious?