Assuming you cleared it right away, there's no pic, right?

I don't blame you, I wouldn't stop to take a pic either unless I was doing a video of the whole session.

Any chance there was a deformed round?

...and you're using the DW supplied mags or maybe Wilson Combat mags? Have you done any training where you dropped a mag in dirt or on gravel?

Did you have any issues during break-in? FTE, FTF, etc.?

I am probably the least qualified person to offer advice on this forum, but you deserve some response. If this happened to me, my first assumption would be something with the magazine unless I had a reason to suspect the ammo. Mags are the weakest part of a semi-auto, especially if they are damaged or get gunk in them from defensive pistol training with emergency reloads.

When I have any one-off failure (if I know the gun is clean), I isolate and mark the mag where I had the issue. Then I go back to my regular routine using other mags. The longer I go without issues, the more likely I think it is that magazine. If I have the same failure with other magazines, time to look elsewhere for the problem. There is no great insight, just basic troubleshooting trying to isolate variables.

I am sorry I don't have a more informed or better answer for you.

 

No pic, I cleared it by removing mag and letting it drop through. Ran same magazine with more rounds and no issues. During break in I had a few failures as described in owners manual. Sluggish operation, may have to tap slide for an incomplete feed. Maybe won’t charge from slide stop but always charged with slingshot. By 200 rounds it was running great. I have a tendency to get left (weak) hand high and touching slide. Same thing at times with my Beretta 92 A1. I have caused a lock back before empty mag by pushing up on slide lock. I’m wondering if I slowed down the slide by interference with weak hand, if the round being stripped could be slid forward in magazine causing an issue with not getting under the extractor. I ran a bunch of snap caps when I got home and if I try to run the action very slow going forward , by holding the slide with hand going forward, I got the same jam. And the next round at top of mag seems further forward in magazine. If I charge with slide lock or slingshot the round gets stripped so fast the next round in mag doesn’t move hardly at all. I think I slowed down the rearward movement of the slide preventing a normal forward slide velocity, resulting in the jam. I get NO jams ever with snap caps letting slide go forward with “shooting type” velocity. If anyone has a better idea, let me know.

 

No pic, I cleared it by removing mag and letting it drop through. Ran same magazine with more rounds and no issues. During break in I had a few failures as described in owners manual. Sluggish operation, may have to tap slide for an incomplete feed. Maybe won’t charge from slide stop but always charged with slingshot. By 200 rounds it was running great. I have a tendency to get left (weak) hand high and touching slide. Same thing at times with my Beretta 92 A1. I have caused a lock back before empty mag by pushing up on slide lock. I’m wondering if I slowed down the slide by interference with weak hand, if the round being stripped could be slid forward in magazine causing an issue with not getting under the extractor. I ran a bunch of snap caps when I got home and if I try to run the action very slow going forward , by holding the slide with hand going forward, I got the same jam. And the next round at top of mag seems further forward in magazine. If I charge with slide lock or slingshot the round gets stripped so fast the next round in mag doesn’t move hardly at all. I think I slowed down the rearward movement of the slide preventing a normal forward slide velocity, resulting in the jam. I get NO jams ever with snap caps letting slide go forward with “shooting type” velocity. If anyone has a better idea, let me know. I only use the factory DW (Metalform ) mags and Wilson Combat 47NX (I think that is correct number)

 

I stand corrected, the weakest part of the semi-auto is the human being. You'd think, after 30 years in IT, I'd know to start with the "chair to keyboard interface."

Well, you're next session you can test by trying to replicate it.

In time, I'm sure somebody with actual knowledge and experience will chime in with some sage advice.

 

I have a DW Kodiak and within the first 250 rounds I had the pleasure of FTF for 3 out of 7 rounds. Very disturbing. I questioned the DW mags and bought WC mags as replacements. No problems since.

 

I have read about FTF on the last round in a mag. Mine was the last round. The consensus is the springs get weak and when the next to last round gets fed it moves the last round forward in the mag from a weekend spring. The spring has the weakest force pushing up when it is least compressed. I’m guessing that the combination of the last round and my weak hand rubbing the slide caused the round to misfeed. Last round was forward in mag, hand interference caused slower slide velocity moving forward. I did remove extractor when I got home and cleaned it and channel. Since that same mag shot well after the malfunction, I think it was 2 issues happening at same time. Even if the spring is not weak, it still has least up force on last round. I intentionally shot several 2 shot mags to test the last round issue and lock back. I concentrated on NOT letting weak hand hot slide. All functioned fine.

 

Some mags have a little dimple on the follower to prevent this. I don't know about 10mm though.

9mm is notorious for that.

Bob

 

My Wilson Combat 47NX magazine has the dimple. My factory DW (made by Metalform) does not. I was using the factory mad without dimple. Like I said this is the first such failure in 600 rounds but maybe that is how long it takes for the springs to weaken just a bit?

 

i had one pistol that had a misshapen spring from new. might just take a look. also is your lube on 'the list'?

 

It sounds like an inertia feed IMHO. Make sure your mag springs are in good condition and that they are clean and free of lubricant/oils.

 

Is an “inertia feed” where the pistol recoiling back allows the top round in magazine to move forward and get ahead of extractor? And if springs are applying enough up force the round will not slip forward? What is the downside of the springs having some lubricant on them? The lubricant on springs might get on the inside of the mag tube and find it’s way on ammo, making the rounds more likely to slip forward on top of stack?