I don't like the stock, so I'll probably work on it again later.
This is the default lower receiver now, it'll be used on the AR and LMG versions as well. So to make production easier, it was decided to make the PDW mags fit the default magwell. So all that you have to do is swap out the upper, bolt, and barrel.
Concept and Art (c) Me
Created using PMG 0.7