Gas check seater…

Description
This die is for those over sized GC check shanks that are so hard on your thumb. It will let you seat the GC check square and true. It does not crimp checks on so you still need to run your bullets through a sizer if you want a crimp. That’s all they do, and they do it right every time. See how quickly and easily GCs can be applied.

https://noebulletmolds.com/site/shop/gas-checks-tools/gas-check-seating-die/gas-check-seating-dies/