Ambidextrous Stainless Lo-Pro Gas Block Barrel 5.56

These barrels are marked ambidextrous because they have certain cuts in the barrel extension so that they can be used in both a right handed ejection AR15 or a left handed ejection AR15.  Its safe to run it with milspec parts for a right hand ejection gun, but if you would like to make a left handed ejection gun you would also need a left handed bolt carrier group as well as a left handed upper receiver.