Oh, I have quite a bit of capsule shop luck myself alright.
Dragon WA_2000 - Spent a total of 13,000 Gcoins on this weapon and still have yet to receive it, this video shows about half of what it took. Good thing they were all free gcoins...
This is part of the gcoins I had, and all of which went into that gun and all of which failed.
Spent 3 million total SP on my first Gold UZI, this was when it was 1/500 chance. I have 4 of them now, I have 3 videos on those.
I'd only go for capsules if you have absolutely everything there is to get and you have no idea what else to spend your AP on. Meaning stacked character for 1 year plus, 4-6+ months items, millions of SP, all current weapons except what you want in capsule shop.
It's a huge rip off because you don't even get SP out of it and you're competing with other players in order to win the weapons, not just a "try you luck" weapon bomb thing where you actually get SP and a variety of items out of it so it isn't totally worthless when you don't get the gun.
Stick to bombs, or better yet, get your AP capsule guns in tier spenders. As for SP ones, wait till it gets low and go all in, always worked for me after they reduced the chances from 1/500 to 1/100.