While we are on Aug topic the A1 plastic receiver seems to be made of a tougher material where as the newer A3 receiver is a softer plastic, reason I bring up this topic of discussion is a MG buddy of mine has a Aug reg pack too & he had Athen's build him a A3 which jammed on him several times. After he worked out the kinks (I think he did) he noticed the area of the ejector port there was a small chunk of plastic gouged out, my A1 has not done this & it would jam several times when I had first received it before getting more comfortable with the platform. Later I came to realize my gun only jammed up due to the sling blocking the ejector port, yes I felt like an idiot but live & learn.