A while ago 2 Vets came out with 5.56 lowers with a part of the funds going to a Vetrans group.Now they have put together some rifles with different features,worth a look: http://www.2vetsarms.com/2VA-5-56-Bravo-p/2va556bravo.htm
The way I understand it red for 3/16" and up blue for smaller.Red on smaller hardware will be tough to remove if you had to.I would be concerned with the amount of heat needed to remove small hardware put on with red.But that is just me.I have broken a 3/8" allen that was put on with red.I wasn't able to get alot of heat on it either.
It works good with the MagPul MS3 clip.Lets you transition left or right hand no binding.For the money GTG.All my collapseable stocks have them except for the one that has the MagPul ASAP.