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  1. J

    Question about changing upper on an AR15

    i currently own an xm15 with the a2 upper and im looking to go flat top so i can mount my eotech on it. the dilema im having is rather to buy just the upper with no barrel or buy a complete upper. what are the advantages/disadvantages of doing this ??? ive heard about possible sight problems if...
  2. J

    Question about changing upper on an AR15

    i currently own an xm15 with the a2 upper and im looking to go flat top so i can mount my eotech on it. the dilema im having is rather to buy just the upper with no barrel or buy a complete upper. what are the advantages/disadvantages of doing this ??? ive heard about possible sight problems if...
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