Like the title says, the slide is not locking back on the last round.
The build is a G45 with afterburner / ramjet combo, Surefire x300T, Tango Down extended slide release, OEM RSA and OEM mags.
I did swap out the plunger for a NP3 coated version from Overwatch and I believe i may have swapped out the trigger bar for the NP3 version.
My Glock 19 gen 4 also has a Radian afterburner / ramjet with Streamlight HLX light. It has an OP trigger in it and I believe i may have swapped out the plunger as well but its been a long time I cant remember. My G19 locks back all the time with OEM mags.
Ammo being carried in the G45 is Hornady 135gr +P and I practice with Federal AE 124gr. Neither is locking back.
My G19 uses Fed HSTs 124gr and I also practice with Fed AE 124gr. It locks back with both.
A few months ago I bought the Radian RSA kit and swapped in the 15lb spring which chases the slide not to lock back. I swapped back in the OEM RSA and still the same issue. I inserted a blank oem mag into the gun, racked the slide back and it locks.
Im not sure what else I can do.
Thanks for the help.