1) Toad, seems to me you might be calling the kettle black, Mr. Pot.
2) Hornet, the fact that it's sitting at the factory actually makes it LOSE credibility. Many of the 4x20mm cannon armed SpitVs were flown out as 4x20mm spitVs, then the instant they got to the field were stripped of the outboard guns (put to use wherever they were needed) and flown as 2x20mm birds.
Many P47s flew out to units as 8x50cal birds, and were changed to 6x50cal birds. PE-2s had a very small mushroom shaped window on each side of the radio room, with an ShVak sticking out each side. These were promptly removed in the field.
Considering that most of the photographic evidence showing planes IN SERVICE shows 6x50cals, I'm of the mind that some of these 20mm planes were stripped of their cannon the instant they got to units. Pilots were confident in their "fiddy cals". They could kill with them and HAD been killing with them for years. They knew how to shoot and when to shoot, and changing all that with a cannon I bet most pilots said "Why change a good thing -- if it ain't broke don't fix it".
P.S. The freakin' title of this thread says F6F-P
I'm done with this thread. It's nothing but "whining for a super gun on my favorite bestest plane evar!!!"