Just lately I have viewed A good number of uppers that happen to be take offs from rebuilt M16A1 rifles remaining marketed as "new substitution uppers". AR15.COM is the globe's major firearm community and it is a gathering place for firearm fanatics of all types. From hunters and armed forces https://mixbookmark.com/story4007394/helping-the-others-realize-the-advantages-of-colt-m16a1-for-sale