***Speak only from personal, firsthand experience, please***
Gen4 Glock 17.
First 300 rds had several FTFs (nose of round against left side o feed ramp) and when shooting 1 rd in mag to slide lock, would not lock slide back on empty mag. After 300 rds, the malfunctions went away.
Weapon has over 3k rounds through it now. 2250 without cleaning. Experienced one failure to lock slide back on empty mag using WWB around 1700 rds. Malfunction did not reoccur with hundreds of rounds of the same ammo. Have not shot it with a light attached.
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