@DopeYourScope - No idea unfortunately, I'm going off of descriptions. I'll have to see if I can find more on RA-Tech's site (if I can find it). Hopefully I can find a retailer with the NPAS available in the UK.
On a side note thank you to the chaps who responded to my queries regarding MWS viability and milsim events, as a result I'm going to keep it and run it. Admittedly I was very torn on the prospect of selling it so now I'm looking forward to exploring the platform to a much more extensive degree.