Picked up this ar last weekend. Bought 500 rounds through palmetto armory. Vltor stock miad grip optics magpul mags optic. Emailed stag about barrel breakin.... no such thing according to them. They said they lead lap then chrome the barrel then lead lap again so no breakin! Then I went to clean it since its new before going to the range no goop or mess! It honestly looked inside the same as after I cleaned it! Fit and finish is awesome no slop very tight between the upper and lower! Shot 500 rounds federal not one malfunction! This company has it going on. Superb product absolutely no issues! Anyone wanting an excellent ar this is it!