Glock Magazines In A Ruger PCC

[SteelCityShooter]

I have a Ruger PC Carbine I purchased when they first came out in early 2018.   It's pretty much stock except for a VQ target hammer but the problem I describe below predates the new hammer.   Used with Ruger SR9 magazines it is 100% reliable. 

 

I've tried the Glock magazine insert with mixed to poor results using both G26 10-round magazines and G18 33-round magazines.   I get failures to lock back on the last round and an occasional ejection of an unfired round (i.e. load 10 rounds, fire 9 rounds followed by a click and find the 10th unfired round on the bench).

 

Any suggestions or comments.  I'd like to be able to rely on Glock magazines but so far I can't.

 

 

[MatroskinT]

Check out if the ejector is not bent . You can feel it if it touches/catches the bolt