No Wolfy, see the thread about a Bren drum mag. The drum was deleveloped to give the Bren a decent antiu aircaraft capability, along with the catridge catch bag. So in the spirit of Adapt , improvise and overcome. a Bren with a drum mag would work, trouble is how would you swivel it? I could see it being carried as dismount weapon, and if you had a guy built like an ox, maybe waist fire from a vehicle. But to be honest fire any weapon from a fast moving vehicle, you're lucky to hit the sky. The SAS tactic on airfeilds was shock and awe, hit fast a lot of stuff flying but slow to specifically hit a target. On any vehicle mount it pays to restrict the arcs to prevent such nasty occureences as shooting the driver, hitting your own engine....:-D
As for windscreens in combat, I know lets have a B***y great heliograph telling the enemy where we are, with the bonus of it spraying us with nasty sharp fragments if hit.