Badger Ordinance has a new universal safety selector for AR15's. How this one is different than ambi selectors, as it can be installed on the right or left hand side of the receiver, because it has detents machined into both sides. Also, because it's machines instead of forged like most selectors, it gives the user a crisp positive click between safe and fire.
Here is a gigantic version
Badger also has a new Micro FTE muzzle break.
And Last but not least, their M7 light mount (for surefire M300 and M600) with an integrated QD socket. This mount really stands out because it's specifically designed to hold the light far enough off the rail as to not interfere with the use of a PEQ.