I fielded my MWS this spring with a combination of 370 mm barrel, ML bucking and modded standard nub ( cut metal rod filling the hole ). Tried geoffs 0.4 yet favored ASG bio 0.32s - a good balance between range, reliance and speed of bb. A cost efficient bio bb that helped me reach out to around 75 m on a good day with no wind.
In general, I’m in favor of the medium weight bbs and their speed opposed to the maximum range slugs. I remember a KC02 dmr with orga and 0.4s - gentrification changed the surroundings before the bb hit the target.
that being said - I’d still Iike to try a 0.34 or 0.36 with the SIX gun nub in my MWS. That could be a sweet spot between range, accuracy and bb speed.