Cheap but usable - Tacfire AR15 Pistol Buffer Tube Kit

Buffer tube is cheap, mars easily, but completely is usable.
Spring is usable, but twangy (it's cheap and no expectation of quiet).
Buffer is a POS, use Loctite or duct tape on the plastic threads to prevent it form falling apart when dry charging (not the right word, but WTH). I'd just buy a new buffer...