World version vs. non-world version gen 1 (metric thread version barrel) lower

[Daver]

Anyone received the world version parts kit from CZ and noticed it is NOT a direct drop-in? The triangular tab that seats in to the upper is different shape AND there is a metal pin in the upper mating area. Options as I see it are either file down the tab to match original or take out the pin.

It would be nice to have fully built 2nd lower to swap out as needed. For instance different trigger pack or maybe just a spare...

What have you done to address this?

[sboone]

I bought a world legal model mfr 2016, and received a complete lower to swap into.  It was a drop in fit for me, I replaced the trigger in the spare with a binary, boxed up the OEM FCG, and used the other one to toy with polishing and making the factory trigger better.

[Asylum9]

Yes there are some slight differences. There use to be instructions posted somewhere, maybe CZ's site? But yeah there are some differences and you are correct. The roll pin needs removed and according to CZ it's not needed.
I don't know why it was designed with un needed parts but sounds like a bs excuse to make something work.

You may want to check the fit and finish before making any decisions. The replacement I received was terrible. The mag clearance was extremely tight and would no longer drop free. Ended up drilling the weld and using the original anyway.