Originally Posted by smullen
Wow, came in late and just saw this....
So who makes a AR Upper in .40 S&W?? (i've seen'em in 9mm and .22, but never .40 or .45 etc..)
Anyone have pics of a completed one???
Anyone tried one out???
Rock River Arms. Have not tried one in .40, but it's on the list. Have shot one in 9mm and it worked well.