I'm not seeing a difference between this one and the last one, so I guess it doesn't make much difference. I'm glad that I'm helping, I like helping people get better at pixel art.
Just a light bit of shading on the right sides, as if the light was offset a little to the left. Also, i just redid the Handgun ammo icon. lighting the cone on top kinda got me for a little bit, and I almost couldnt figure out what to do with the one on it's side...

but here it is. And if you like helping, just wait until i start trying to create sprites or generator parts... lol i will need help in droves!
Edit:
@Sharm I fixed the machine gun ammo belt and the rifle cartridges as well. I felt like I had to dither a bit at the top, where the brass part of the cylinder slopes inwards; so I'm not sure if i got the lighting at that part correct.
Also, I redid the bokuto, and added a tsuba, and hopefully rendered the lighting a bit better. As if the light source were offset slightly from the lower left. Also, I found that adding a "wrapping" to the hand guard helped quite a bit in masking the hard edge of the pixels from the overall curve, yet still allowing me to maintain the shape. If that makes any sense. Thoughts?
And new stuff, my attempt at making a Silvered Steel, "Slug/Bolt" that would be used for a Rail-gun. getting the lighting on this was difficult, as the flanges are supposed to be angled outwards from a cylindrical center.
And finally, my imagined "Energy Packs" for lasers and stuff. It's kind of a challenge as I wanted the bottom to be kind of a concave surface, as if the sides of a cube were curved inwards; whereas the top is supposed to be cylindrical... Also, I want to show the energy inside the cylinder, and also the "glow" that it emits... could definitely use some advice on this one for sure.
So, I did a bit more, and i'm still not sure about lighting on a spherical object; especially when the entire object i supposed to be OD Green. Can you tell what it is having never seen one in real life?

M68 Frag Grenade.