When I first saw the specs to the then called Magapull Masada, I noticed it has similar features to the SCAR. The charging handle, top rail, folding adjustable stock. The only other difference is the slide release for the Bushmaster ACR now as it is called is the slide release next to the trigger, which is like the one the XM8 had.

To me the whole shape of the SCAR seems a bit too rough

They are similar because they came from the same family, the AR18.

Magapull Masada/ACR was suppose to come out last year. Bushmaster had everything that was needed to start production but hold off because of the new military small arms competition.