The XP-47B was very heavy compared with contemporary single-engined fighters, with an empty weight of , or 65% more than the YP-43. Kartveli said, "It will be a dinosaur, but it will be a dinosaur with good proportions"."P-47 Thunderbolt". TopFighters.com. Retrieved: 12 July 2006. The armament was eight .50-caliber (12.7 mm) "light-barrel" Browning AN/M2 machine guns, four in each wing. The guns were staggered to allow feeding from side-by-side ammunition boxes, each with 350 rounds. All eight guns gave the fighter a combined rate of fire around 100 rounds per second.Masefield, Peter. "First Analysis of the Thunderbolt." Flying, August 1943, p. 190.
The XP-47B was very heavy compared with contemporary single-engined fighters, with an empty weight of , or 65% more than the YP-43. Kartveli said, "It will be a dinosaur, but it will be a dinosaur with good proportions"."P-47 Thunderbolt". TopFig,hters.com. Retrieved: 12 July 2006. The armament was eight .50-caliber (12.7 mm) "light-barrel" Browning AN/M2 machine guns, four in each wing. The guns were staggered to allow feeding from side-by-side ammunition boxes, each with 350 rounds. All eight guns gave the fighter a combined rate of fire around 100 rounds per second.Masefield, Peter. "First Analysis of the Thunderbolt." Flying August 1943, p. 190.