Best lower parts kit ever - ERGO AR-15 Enhanced Lower Parts Kit

Okay, perhaps the title is an overstatement as there are so many out there. However, of the others that I've used, this is by far the best and most complete kit.
For this to be the case for you, you have to like the Ergo grip. I do. I like it much better than the standard M4 grip and better than Magpul's grip. That said, if you're into the grip, everything else is great.
There are two captive trigger pins which is a nice extra.
The mag release is tapered towards your finger and has a nice feel to it. It's a little thing, but its nice.
The take down pins are tight against the detent. I did find that applying some oil and working them back and forth several times to "wear" them in helped. There is one reviewer that commented on removing the pins being difficult - I don't know about you, but take down pins are captive and should not be removed on a routine basis. You may need to use a cartridge to start the pins out (or a Delrin punch) though.
A surprise was the 45°/90° safety. I didn't know I needed a 45° throw safety until I installed this one. The ambidextrous lever is easy to use and the 45° throw allows me to operate the safety on and off with my strong side hand without changing my grip.
The safety has detents for 45° and 90° throws. Mine came set up for the 45° throw. To change it to the 90° throw, the selector levers would need to be flipped 180° to allow the 90° detents to be in the proper place.
Finally, my lower kit did come with a hex head grip screw and star nut. This is not on the list of included items as was a nice surprise.
All of this for a price that is well less than the component parts.