I actually struggled between building a slick side using an Air Force M16 upper and this XM. The XM is handier, and also I built it with a 1/9 barrel so it should handle most weight bullets up to 75 grains. A 1/12 would only do 55s and some 62s! In addition, people were asking stupid high prices for retro upper halves! Three years ago you could not give away a retro AR, and upper halves were $250 to $275 from CDNN. Now people are getting $400 without bolt groups.Information
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