Pappy,
The 17 and 34 take the same mag.You can also get a 33 round Glock
mag that will work in the 17-19-26=34,Load on friday shoot all
weekend!!!! If you don't have a loader you can rest assured you will have sore thumbs...

Billy Poyner
RKO-RKS#5030
NRA Endowment
MM