Looking it over I suggest actually dividing the Appearance and Operation into separate sections. Specifically, stuff regarding the operation of the weapon can go into the weapon mechanisms area. You can actually have a paragraph under Weapon Mechanisms, and take stuff out of the bullet points to be put into the paragraph if you'd like. A little bit more detail can be given to describe the iron sights, but that's completely optional. I think the weapon is good to go other than what I previously mentioned.
The company looks good to me as well, though for the ammo? I suggest stating if it's brass cased, and if the case is rimmed or rimless(recessed rim). You may also have varieties of projectiles ranging from FMJ to JHP to Cast Lead and Sabot even, but that's all up to you. If you don't make varieties at this time, you just need to state what the default bullet is. No problems with the cell though since it's a space battery.