The A-26B had up to 8 in the nose (2 was standard on the A-26C), some fitted with cannon instead. Had no idea they added gun pods to this. Looking it up I found most were fitted with 6 in the nose, but had up to 10 more in a combination of belly packs and gun pods. That's a crazy plane.

Okay, more planes: fastest piston fighter to enter service. There are really 3 answers for various reasons, any will do but all three for maximum brownie points.