It's no secret I Like the Spikes LPK, but truth be told almost all parts for Lower Kits are made by the same few company's. The only LPK I ever had trouble with was a Daniel Defense kit that had several out of spec parts. It just goes to show that even the best can have some bad parts from time to time because DD has a reputation of having one of the Best LPKs.
I've used DPMS, Spikes, Rock River and DD and almost anywhere you look you will get a quality LPK.
The last one I put in was a Spikes Enhanced LPK with all the bells and whistles and It was very good, But at 150.00 it had better be. It came with,
-Spike's Billet Trigger guard w/Set screw
-KNS Gen II Mod II Anti-Rotation pins
-Spider Logo'd Ergo grip (Choose from Black, FDE, or OD Green)
-ST Battle trigger with Nickel Boron Coated Mil-Spec Single Stage Trigger, Disconnect, and Rounded hammer
-Ambi Safety Selector
-Mil-Spec bolt catch, mag catch, and mag catch button
-Mil-Spec detents, plungers, pins, and springs
-Quality Spiral roll pins for trigger guard and bolt catch
-1/4 Allen screw with washer for grip
I went online a few days ago to order another and they were out of stock.
ETA I just checked and it looks like Joe Bob Outfitter has them in stock.