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This is a relatively common issue with clones and crap-so so guns...I haven't seen "good-old" brands have wonky shells like this. Because of the wonky specs, they're not worth upgrading/modding/tuning/repairing. Well...sort of worth it, but they are a pain in the ass.
Buy a new mechbox...a new cut off lever (a lot of clone ones are just weirdly off a bit). Buy an extra pack of shims too.
If that doesn't work...consider buying a new mechbox...because the time/money troubleshooting it might be enough that it's just not worth trying to make it work.
If you want to fiddle and build a good mechbox...start with good parts. If you just want a mechbox you can shoot...just buy another clone one and toss it when it blows up (some last a long time...others don't). Then just swap in a new clone one.
A good, well built mechbox will cost you about $200-300. A clone one will run you $75-90.
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