Yeah, the guns bug me a bit. Lots of missing sights on M4's and other railed guns. Way too many rare and exotic automatic weapons, and (almost) no conservation of ammo.
I was completely shocked when I saw a reloading press in Woodbury. It's not surprising if the writers are completely unaware of such things. But seeing the reloading press there means that someone knew what it was and put it there. And that he was the only person on the whole damn crew who knew what it was.
Merle was such a fantastic character that I was willing to overlook the odds of a successfully performed hacksaw amputation, and the bayonet was so awesome it more than makes up for it.