These weigh almost as much as a loaded round:

https://www.amazon.com/Steelworx-Stainless-Training-Rounds-Silver/dp/B08YWWNSLV/ref=mp_s_a_1_5?crid=6BBCNNBHAZ7H&keywords=stainless+steel+practice+rounds&qid=1688764566&sprefix=stainless+steel+practice+rounds+%2Caps%2C137&sr=8-5

If you're going to use them for more than function testing, add these for dry fire training:

https://www.amazon.com/Pack-Safety-Training-Pistol-Magazine/dp/B07CNBDHSB/ref=mp_s_a_1_12?crid=231B4YZRQIG9N&keywords=orange+follower+block&qid=1688764651&sprefix=orange+follower+block%2Caps%2C109&sr=8-12

Throw a laser cartridge in your chamber, print out some 1/3 scale targets, remove all live ammunition from the room, and get to work training!