I’ve been shooting 5.45 [5.45x39mm Russian] AR platforms for several years now, but the Spike’s Tactical is the best, by far. The names of the other brands are not important, other than the fact that they all ran well and were both direct impingement and piston driven. Reliability being the same, overall accuracy and shootability goes to the Spike’s 16” mid-length gas system direct impingement-driven rifle.