yeah, its the mag well that its not locking into, seems to go all the way in but no lock so it just pulls striaght out without hitting the mag release.
as for the seletor switch i may have resolved the main issue just by lubing it up, its not great but should do for now.
in terms of the V3 nozzle i see theres a little confusion of weather its V3 or v3.5...well my understanding it the lugs should be slightly shorter than the end of the thing that holds it and mine seems to be slightly shorter although i would say only slighty, maybe 2mm or so, dono if thats the new one or not..?