[rman]

Picked up my new KP90D at the range's gun shop last night. Shot 100 rounds through it. I guess everyone who raves about how accurate the P90 is knows what they are talking about. I also have a 345 and a 97. Both are accurate, but not as accurate as this one. This thing drills one big hole at 7 yards and keeps them all in the black at 20 yards. I didn't try shooting from sand bags, but I'm guessing it would do really well.

There were no failures to feed, failures to fire or failures to eject. There was one really weird thing that happened. I've been shooting for years and this is a new one on me. I loaded 5 rounds of WWB in the clip and started a rapid fire string. I fired 4 shots and the 4th one didn't feel right. I also thought I saw muzzle flash from the ejection port and the slide locked back. I checked the chamber and the mag and both were empty. Looked in my ammo box and confirmed I had indeed loaded 5. I checked the floor around me and in front of me and to my left was my unfired round! This all happened at about 20 rounds. Fired the rest of the 100 rounds using both mags with no problems. What the Heck was that all about? Has anyone ever had this happen to them?
Tom

 

[Baldy]

I have seen them double fire but never eject the next loaded round. When they double fire you have to be paying close attention or you'll miss it. It happens real fast. Usually a firing pin stuck or broke.
Sounds like you barrel and slide lugs did not mate up like there suppose too. That's a timing issuse. Iowegan could shed a lot more light on it than me. You might mail him. Good Luck.

 

[rman]

Another 50 rounds through the KP90D last night and 50 through the KP97D. Man these things shoot good!

 

[Iowegan]

rman, What you probably experienced was a "slam fire". For a short time the gun went full auto. Though not real common, I have seen this in about every make and model of semi-autos, especially in new guns. In all cases I have seen, the firing pin didn't retract and when the slide sprung forward, it would fire another round.

In your P gun, and knowing how Ruger doesn't spend much time deburring, I would bet a burr broke loose and wedged the firing pin. The pressure and recoil dislodged the burr and fixed itself.

This is one of the many reasons why I always detail strip a new gun and go through it. It's very normal to find galling, burrs, sharp edges, and machine marks. Once these are cleaned up, P-guns tend to be very reliable.

 

[sheepdog]

With the firing pin extended because of debris or a burr-that means the gun was not completely in battery when pin hit the primer and trigger was not necessarily pulled-that would have possibly emptied a full clip independent of the trigger before clearing itself and may not have cleared itself-I don't understand what dumped the last round on the ground unfired.

 

[rman]

quote:Originally posted by iowegan

rman, What you probably experienced was a "slam fire". For a short time the gun went full auto. Though not real common, I have seen this in about every make and model of semi-autos, especially in new guns. In all cases I have seen, the firing pin didn't retract and when the slide sprung forward, it would fire another round.

In your P gun, and knowing how Ruger doesn't spend much time deburring, I would bet a burr broke loose and wedged the firing pin. The pressure and recoil dislodged the burr and fixed itself.

This is one of the many reasons why I always detail strip a new gun and go through it. It's very normal to find galling, burrs, sharp edges, and machine marks. Once these are cleaned up, P-guns tend to be very reliable.

quote:Originally posted by sheepdog

With the firing pin extended because of debris or a burr-that means the gun was not completely in battery when pin hit the primer and trigger was not necessarily pulled-that would have possibly emptied a full clip independent of the trigger before clearing itself and may not have cleared itself-I don't understand what dumped the last round on the ground unfired.

I had a 1911 double on me once, but never had one pop out a live round. Well whatever the problem was, it seems to be OK now. I shot another 50 rounds through it last night and it worked great.
Tom

 

[sheepdog]

My next planned purchase is a P90D-I winder what tools I should have on hand to spiff it up when I get it?

 

[Iowegan]

I blew it on this one. I failed to read in your post about a live round popping out. Disreguard previous.

Now for the real issue: Check your magazine. Sometimes the follower sticks then pops up from recoil just as the slide is starting forward. This will make the live round jump out of the magazine while the extraction port is open and be kicked forward out of the gun.

Use a screw driver and press down on your magazine follower. You will probably find a sticky spot. I always dress the lips on the magazine and file off the sharp edges under the side roll.

 

[sheepdog]

What tools should I have when I get my P90 to deburr and dis/re-assemble it?

 

[Iowegan]

sheepdog, You will need a set of fine jeweler's files, a set of small punches, a hammer, and some 400 grit W/D sandpaper. You will be amazed at what you will find. All the stamped parts have razor sharp edges. You will see galling from machining, especially in a stainless gun.

 

[sheepdog]

Probably at say-Northern Tool? Nothing can be harmed by smoothing and softening edges (other than the sear)-right? My gunsmithing is limited to changing a magazine release once and cleaning...I know SS doesn't machine as cleanly as cold steel-I'm gonna try it!! Thanks.