Quote History Quoted:
Sorry, not sure what that looks like. Will research and update.
View Quote
The upper receiver blocking bar is the black oval in this picture between both the rear sights. About 1/4" below the sight rail.
And the lower receiver takedown tab reduction....the world regal models have slightly wider trunnions. To account for this wider trunnion, CZ milled the steel reenforcment tabs in the lower to half their original thickness. They will be shiny in color, may exhibit machine marks and metal burrs, and are about .025 thick instead of around .050 thick. This prevents installation of an original FA trigger pack in conjunction with the spot welded takedown screw.
(note this picture shows the original thickness on the takedown hole re-enforcing sheet metal)
NOTE -a welded screw is only ONE characteristic that make a lower a world legal lower - an insignificant one at that.
The MAIN DIFFERENCE is the lower receiver takedown tab reduction. If your tabs have reinforced steel that has been reduced, you DO have a world legal lower.