Whats happening with my HK?

[HKcenterMass]

Hey all, I have a USP45, about 3,000 rounds through it. The last two times ive been shooting, i have, at least three times, had the slide close on a live round. I have to pull the slide back, and eject the round to move on tho the next. I thought it could be the ammo, I use UMC ammo, but i've never had an issue with it before. Anyone know the cause and resolution? could it be a bad magazine?

REdo: basically, the slide closes, but not all the way... so the live round seems to be up too high, so the slide doesnt close all the way. Sorry about the confusion.

 

[JohnKSa]

Reread your post carefully and edit it. It doesn't make sense the way it's written...

 

[10-Ring]

i have, at least three times, had the slide close on a live round.

?? So,if there's a live round in the chamber, isn't it just then a matter of pulling the trigger?

 

[QB]

What I think I hear you saying is that the slide tries to chamber a round but does not close fully (doesn't not fully go into battery) and that you have to cycle the slide to eject the live round and feed another round into the chamber. When you do this the next round fully feeds and the slide closes/gun goes into battery.

If so,

Have you taken a good look at the chamber for any buildup, etc.? What about the feedramp....any burrs or gouges or rough spots????

 

[HKcenterMass]

right you are sir. thats whats happening. Pardon my ignorance, but is the feed ramp the opening of the barrell? to be honest, i strip and clean the gun after every use, but i havent cleaned the mags at all since i got the gun.

 

[JohnKSa]

Sound like one of two things.

Either the chamber is dirty or the ammo is slightly oversized.

If you put the round back in the magazine will it chamber fully on the second try?

I had a batch of S&B 9mm where every 10th round or so wouldn't chamber in a Ruger P89DC.

 

[MisterX]

or your mag springs are shot and need to be replaced, or like you said just clean/lube the mag springs...

 

[CB900F]

MisterX;
I would not recommend lubing the magazine. I have an H&K & am familiar with the magazine arrangement on the USP series both full size & compact. The spring certainly does not need lubrication. If the follower does not ride up & down in the mag freely, lube, or lack of it, is not the problem. All lube is going to do is attract dirt. I'd invest a small amount in a case guage & start checking those UMC's. 900F

 

[HKcenterMass]

hmmm you may have something there about the ammo...so far, its only happened with umc. I havent shot too much of anything else, maybe 200 rounds of S&B, 50 rounds of hornady, 100 rnds of blazer. I guess i'll start with the ammo.

 

[Al Thompson]

Really sounds like the ammo to me too.