I received my G48 MOS back from Glock last week. There were no notes that specified what work, if any, was performed; there was a packing list which suggested they replaced my RSA and firing pin safety. Today I fired:
- 120 rounds Federal P9HST1 124gr
- 50 rounds Federal P9HST2 147gr
I had no malfunctions. The 147gr ammunition did feel a tad sluggish in cycling during two rounds fired WHO, but I noted no other issues. The rounds did not nose dive as I experienced earlier, whether the gun was charged via releasing the slide manually or with the slide stop. I could not keep all 10 in the black for the life of me today, but for the rounds where I did my part, the gun was 10-ring accurate with the 124s at 25. I did have to come up about 2” and right about a half inch on my zero.
So another update.
After I got it back from Glock it was fine for most of the range session with staying a touch out of battery a couple time until the trigger was released.
I saw various posts about the firing pin block plunger deal having a bent or on an angle spring. So I stripped the slide down and cleaned everything and put it back together. Nothing seemed obviously overly dirty or bent, damaged, etc while looking at it.
Today I took it to the range to sight in the 407k I mounted Friday. No issues, no sluggishness. Weird but I’ll take the win. Maybe there was a little piece of something somewhere where it shouldn’t have been and I got it out.
On the plus side, man do I like a dot. Helps with my aging eyes.
I had similar issues with my G48. For the first ~500 rounds I did not have any issues. Then I went to a GSSF outdoor match and had the same RTB issues you did. After that match I fully stripped the pistol, noting the lack of lube on the barrel, cleaned and had no issues thereafter. I do make sure there is appropriate lube on the barrel/slide now, however.
So, either I had a lube issue (likely) or I managed to unknowingly resolve the FP safety spring issue. The pistol is approaching 2k rounds now. FWIW.
"Detached reflection cannot be demanded in the presence of an uplifted knife." - Justice Oliver Wendell Holmes, Brown v. United States, 256 U.S. 335 (1921)
For what it’s worth, a brand new 43X MOS has thus far not presented these issues.