I am a certified armorer, former NCIO of my unit armory (USMC), f9 1/2 year private security contractor in Iraq and Afghanistan, irearms/ SWAT instructor, and current full time training officer in a US state’s capitol city… I say all of that to inform you of my probability of knowing real world information regarding firearms. Simply put Arm or Ally is the best deal on quality components that I have ever found. Aero Precision parts and AorA parts (particularly the forged uppers) have proven to be excellent. I have purchased many of all of them and my friends/ students/ co-workers have done the same on my advice. What more can there be? Great quality, great times on order fulfillment, best prices on top tier gear; Arm or Ally has earned my continued support and custom. Thanks AorA, Charlie