I would hope its 5.56, lol. What I meant is what style of AR. What length barrel, what type upper? A1,2,3,4. Since I have my SIG556 with a 16in barrel, Ill make my first AR a M16 copy, 20in A4 upper with heavy barrel. I prefer flat top(rails) instead of the carry handle because you have so many option for sights and optics. Im a noob when it comes to AR's but Ive been researching pretty hard recently.



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