This weekend, I'll be shooting my Gen4 G22 with the Glock .357 SIG barrel in an IDPA match-I have some .357 SIG ball that was begging to be used, and I'm moving into a Glock phase for IDPA and GSSF. When preloading my magazines for the match, one of the followers did not pop over the internal feed lip ledge to go into its final position when the last round was expended.
The magazine in question is a G31 .357 SIG specific one, probably 2 years old at the most, and barely used. I have two others; they're probably unnecessary, as in the full-size Glocks the .40 magazines do quite nicely with .357 SIG cartridges, but I decided for basic .357 SIG use I'd get and use .357 SIG magazines. The remaining 2 magazines had no issues with the follower positioning.
Thinking I had a defective spring, I disassembled the magazine, brushed out the tube, and checked the follower for molding burrs or remaining molding sprue, everything seemed just fine.
Then when I placed the spring in the tube checking for fit to further isolate the problem, I noticed that it would click into final position, with a perceptible "click." After that seemed to be working, after exercising it several times, I reassembled the magazine, and experimented with cartridges-it now works fine.
I have no idea what caused the follower hesitation/lag, but evidently the disassembly and working it several times evidently caused it to work itself into compliance (not grunge or residue came out of the tube when I brushed it out).
I'll see how it does in the match; while it's moved from the "naughty" list, it's still in the "trust but verify" category before being used for carry. The follower in question is marked ".357 5"
I've shot Glocks for many years and have multiple and current Armorer certifications, but this problem was a first. Anyone else experience anything similar?
Best, Jon