General discussion

If this works...I love you...

Will it be updated to a new Factorio version?

Made it. Not fully tested it yet, but I think it works.
Just launch the mod again and again and fix errors that Factorio warns you about. There are not many of them.
There is also this guide: https://forums.factorio.com/viewtopic.php?t=54579&p=321533
..but it's not really needed.
My changelog:
~ edit info.json to be compatible with new factorio (version number)
+ add icon_size key to "bolt" (ammo), "bolt-ap" (ammo), "bolter" (gun)
~ perimeter = 4 -> radius = 4 in "bolt-ap" (ammo) / type = "area"

File upload: (in case you are lazy or trust me)
https://yadi.sk/d/iVCownnBVnyX4Q

@Musickiller, thanks, update mod to 0.17 game version

Very nice mod, I love it!
Please, think about adding twin/stormbolter (x2 fire rate) and Heavy bolter (greater range and heavier bolts).
Also would be nice to see another types of bolts!
Some ideas: "Metal storm" (like shotgun), "Hellfire" (from uranium), Cluster-, Psi-, Warp-, Plasma-, etc.

Reference (Sorry, can't find it in eanglish):
https://i1.imageban.ru/out/2019/10/28/732942adbfb073775d412e893322ae1e.jpg

+1. Would be cool to see more bolter variants.

@MrSilver2510, @Dansjunkbot sory for late comment. Yes, i'll do more variants :)