I have thought of trying to recreate the MW2019 "Stock M16 Grenadier" barrel assembly. I was convicned that the lower section fo the M5 RAS will fit however it turns out it does not due to the heat shield bending inwards at the half part of the shield which means it's short couple of mm's to fit inside perfectly. I have come across somebody else with the same idea and they ended up cutting up the rail to make it more slim. I have looked around the interent at different rails to see if they would perhaps be slightly slimmer but it looks like they are all the same size to fit perfectly in the delta ring and the retainer at the front sight. My question is if there is an actuall slimer rail that would attacht like the M5 RAS & other drop in rails. Perhaps there's a better way to just mount a rail section which I have not thought of? I've attached the pictures from somebody that has completed the build.