No, I didn't experience the bullseye that you did, but that may be an issue with eye relief...or simply that the supplied scope is...simply put...garbage. I hear ya regarding not wanting to spend money, but I'll make an observation...for what you have spent on your Swarm, you could have used that $200 on those traps you mentioned in your first post! So, I suspect, like me, you might be wanting to be a little more 'sporting' about the problem!
I'm in a urban area north of LA, and I understand the 'no shotgun' issue for certain! I have found the Hammers scope to be quite adequate and reliable from Amazon, although Amazon's packaging leaves MUCH to be desired! As I step up in scope quality in my airgun journey, I'm stepping away from Amazon because of their crappy packaging, and buying my scopes from Pyramyd Air, and as time goes along, probably from other vendors, as well. Yes, it takes much longer to get my merchandise, unless I wanna pony up the big bux, but when it gets here, it's safe and sound!
So, in short, I suggest you stick with your Swarm, get a good scope for it, don't worry about the magazines, and learn how to drive tacks in the shooting style that you'll be using on them thar varmints! You'll have a lotta fun along the way!