If I am still around (32 yrs).... I plan on recommending this.
In years past, Admin would only approve the purchase of 30 +/- Glocks a budget year.
It took 5 years and I cant recall what year Gen 5 came to but officers who were issued Gen 4s the previous years wanted to trade for Gen 5s (hA!)
We try to replace our Glocks every 10 years (with a trade in program).
I think 2025-26 will be the first batch to hit the 10 year mark.