Glock. Slide peening. (frame flex, locking block contacts slide ways, legs of locking block marks/peens slide way)
Couple notes. It happens on all glocks. The position of the locking block and the flex in the polymer frame at that point causes it. Its normal. In heavy calibers it can be more pronounced than in lighter calibers.
Typically, the peening of the slide ways is ignored and its cosmetic only. Occasionally, it raises an burr inside the slide that is objectionable but usually only cosmetic. Peening proceeds quickly to a maximum point and then effectively stops causing no functional or reliability issues. However, some owners may find they can't ignore it.
Glock owners have several choices where slide peening is concerned. Ignore it. Stone off any burr that occurs both in the slide way and to the inside of the slide where the square end of the barrel resides. Trade for a gun that doesn't flex in a manner that lightly peens the inside of the slide ways.
Essentially, it occurs, most never notice it.
Here on a 45 ACP Glock 21 made in the 90s. Lightly peened. Except for silver spots in a vast field of black, hardly visually noticeable and barely felt by a finger.
And here on a 50GI slide. Slightly more peening but essentially done growing. I found a burr to the inside that rubbed the barrel chamber end on disassembly. I stoned the burr off. I expect no further significant peening and will probably check once or twice more for burrs and then ignore it altogether.
Couple notes. It happens on all glocks. The position of the locking block and the flex in the polymer frame at that point causes it. Its normal. In heavy calibers it can be more pronounced than in lighter calibers.
Typically, the peening of the slide ways is ignored and its cosmetic only. Occasionally, it raises an burr inside the slide that is objectionable but usually only cosmetic. Peening proceeds quickly to a maximum point and then effectively stops causing no functional or reliability issues. However, some owners may find they can't ignore it.
Glock owners have several choices where slide peening is concerned. Ignore it. Stone off any burr that occurs both in the slide way and to the inside of the slide where the square end of the barrel resides. Trade for a gun that doesn't flex in a manner that lightly peens the inside of the slide ways.
Essentially, it occurs, most never notice it.
Here on a 45 ACP Glock 21 made in the 90s. Lightly peened. Except for silver spots in a vast field of black, hardly visually noticeable and barely felt by a finger.
And here on a 50GI slide. Slightly more peening but essentially done growing. I found a burr to the inside that rubbed the barrel chamber end on disassembly. I stoned the burr off. I expect no further significant peening and will probably check once or twice more for burrs and then ignore it altogether.