PM9 - What causes peening?

[rvbgtr]

Anyone ever figure out what actually causes the peening that has been complained of? I noticed on another site that it has been attributed to a barrel that is able to move when locked in the slide. As I understande, according to this theory, once the pistol fires, if there is play in barrel to slide lock up, the barrel can slam forward into the slide before it drops down. Wondering if those of you that have had peening have noticed that the barrel can move when it should be locked in the slide, or those who don't have peening don't have any such movement. Thanks,

[JKG]

I don't know if that's the culprit, but my PM9 has zero peening and no barrel slop (locks solid).

The peening might be due to out of spec tolerances or incorrect material. Calipers, micrometers, and hardness test could verify.

[rvbgtr]

Thanks, anybody else notice slop and peening or no slop and no peening?

[LApm9]

I have been monitoring the gap between the front of the barrel hood and the rear of the slide opening since I noticed an impact mark on the barrel hood.
At 700 rounds it was 0.010" gap between the barrel hood and slide and a additional 0.002" at the impact mark. 150 rounds later the dimnsions were 0.013" and 0.002" respectively. 235 rounds later they were 0.015" and 0.003". The little ridge is becoming more prominent now and is beginning to "catch" when going into battery.

I'll have to shoot some more to get it to the failure point, so it can get fixed.

This is very tiresome!

PS: Just bought a nice little S&W 642 w/laser grip sights for less than $500. Shot a box through it to check the zero, and she's ready to carry. No break in, no testing carry rounds, just "insert bullet pointy end first" and go.

Not as easy to conceal though!

[JerryinPA]

Originally posted by LApm9
..................

PS: Just bought a nice little S&W 642 w/laser grip sights for less than $500. Shot a box through it to check the zero, and she's ready to carry. No break in, no testing carry rounds, just "insert bullet pointy end first" and go.

Not as easy to conceal though!

Hey LApm9,

If you want to make your 642 easier to conceal, take off the laser grips and put on some smooth wood grips... myself, I like "Eagle Secret Service" grips.

JerryinPA

[CalGlock]

I have a sig 229 40 cal. I always shoot 180 grain through it and no peening. Then tried out some corbon 155 gr. I felt stonger recoil, brought the pistol home took it apart and their was peening. I went back to the 180 gr. No more peening. Maybe that tells something? I just know I don't get it anymore.

[LApm9]

Originally posted by JerryinPA
Hey LApm9,

If you want to make your 642 easier to conceal, take off the laser grips and put on some smooth wood grips... myself, I like "Eagle Secret Service" grips.

JerryinPA

Agreed! But these CrimsonTrace grips are so effective that I can't imagine not using them. I think I'll suffer the extra thickness in the grips.

I still love how that PM9 vanishes, and how well it shoots.

[tabor-pm-9]

Originally posted by LApm9
I have been monitoring the gap between the front of the barrel hood and the rear of the slide opening since I noticed an impact mark on the barrel hood.
At 700 rounds it was 0.010" gap between the barrel hood and slide and a additional 0.002" at the impact mark. 150 rounds later the dimnsions were 0.013" and 0.002" respectively. 235 rounds later they were 0.015" and 0.003". The little ridge is becoming more prominent now and is beginning to "catch" when going into battery.

I'll have to shoot some more to get it to the failure point, so it can get fixed.

Why not tell them it has failed and send the slide in? That is what I would do. If they give you any crap, I would 1. insist is wasn't going into battery and 2. insist that this is you cary gun and this is unacceptable.