How to adjust if the rivet gun cannot bite the rivet?

In this case, it is generally necessary to replace the claw of the rivet gun! You can take down the head shell of the rivet gun to see if the claw pieces inside have been worn. If the teeth have no grooves, you can’t replace the claw teeth to solve this problem!

https://www.yukerivet.com/news/the-core-of-the-blind-rivet-is-not-completely-pulled-out-what-is-the-reason-for-the-fracture/