Thanks gents, interesting stuff, then again this aircraft is very interesting anyhow, the more you read about it, the more quirks you find out! : )
Locking the guns forward, would explain the firing button on the pilots control column Clive, that had me a little confused! lol
Never understood, apart from the weight issues, why it was never fitted with wing mounted guns, surely the powerplant could have been uprated to compensate?
The Martin Baltimore was fitted with this turret, to name one, but I've Googled till my fingers have bled, I can't find enything of good use of what I need! LOL
Seems it had some good success at first, must have been a shock to the first German pilots that came up against it, pulling on to a fighters tail, then getting shot down?
However the Germans soon realized that the guns couldn't be pointed down, so they just shot the Defiant in the belly, with great success, this resulted in the Defiant beeing pulled from daytime duties, and the nightfighter version was born.