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Google usually helps but coming from the military we are trained with the m16-m4 same thing just with a burst fire option but , the AR 15 is an air cooled , shoulder fired gas operated Simi automatic rifle that accepts a 30 round mag ... Accurate up to 500yards I had held tight groups at 300yards , they fire a 5.56-45 round or the .223 , an AR 10 is the same thing but fires the 7.62-51, or the .308...
 

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Well that makes more sence lol my bad ... Usually any mil spec ar upper or lower is good I have no preference if it was built to the same spec as any other rifle it's good I have never seen a bad ar, the S&w mp15 is the cheapest and I love the rifle so after have had over 6 diff company ar's any are good...
 
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