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Wilson combat upper

The mags and the upper/ lower are two different things. I can't answer the question on the WC upper to KAC lower. I do know that there are several brands that take SR-25 pattern mags but upper/lowers do not fit.
 
@Mj30wilson900 Wilson is NOT compatible with SR25/ LMT I have tried this. Their geometry is proprietary and wont match up. Also, I was able to get a refund for the upper but it took close to a month. I am working on posting a full write up of SR25 "Slant Cut" compatibility. I have been studying this for a few months and I am probably the worlds foremost expert on the subject... LOL