New HK USP .45 Expert - jamming on last round?

[dminor]

Hi all,

I took my HK .45 Expert out yesterday to Oak Tree. I lightly cleaned / lubed it before getting started and noted an issue. Out of 10 reloads, 3 of them jammed on the last round in the magazine.

I'm not super familiar with malfunction names, but it was the kind of malfunction that required me to forcefully pull the magazine out before racking the slide. When I looked at the malfunction, the round looked like it was misfed into the chamber and was diagonal.

Now, my question. If the weapon is jamming on the last round with some consistency, does this indicate a magazine issue?? Bear in mind, this gun is brand new. ~150 rounds through it.

[elSquid]

[DrewN]

10 different mags or same mag 10 times? Did you strip,clean and lube the new mags?

[RustyIron]

A USP should eat just about anything you feed it. I don't know what Oak Tree is. Do they sell underpowered reloads?

[rodralig]

Hi all,

I took my HK .45 Expert out yesterday to Oak Tree. I lightly cleaned / lubed it before getting started and noted an issue. Out of 10 magazines, 3 of them jammed on the last round in the magazine.

You have 10 magazines for the H&K...?

That said, never had that happen to my Expert... As others have already mentioned - magazine or ammo. Number your magazine appropriately.

But I will add one more, albeit, improbably - user induced malfunction. Such, to cover all bases -

Have someone else try the pistol... Use other types of more established/reliable ammo (yeah, there has been a proliferation of low quality ammo nowadays - "Venom" from Turkey in my experience).


On a separate note - if you already have the USP Expert - why are you still looking for a 1911 as your nightstand gun? The H&K is way plenty sufficient. In a gunfight/combat/SHTF scenario - I would rather have an H&K rather than a 1911...


_

[CWL]

How old is the gun and how old are your magazines? Top 3 reasons this might be happening from most common to least.

1. Consistent FTFs on the last round is a magazine issue, usually an indicator that it is time to change the springs. The springs have gotten too weak to feed that round quickly-enough for the slide to push it into the chamber. Solution: replace mag springs.

2. A sign that mag springs are too strong and is forcing that last round too quickly before slide has a chance to cycle. Solution: Give springs a chance to break-in.

3. An indicator that slide needs new springs as it is not strong enough to strip & cycle the last round. Solution: replace recoil springs.

If it is an old pistol, perhaps it is time to replace mag & recoil springs, plus any other parts necessary.

[SkyHawk]

3. An indicator that slide needs new springs as it is not strong enough to strip & cycle the last round. Solution: replace recoil springs.

But isn't the last round the easiest to strip

[Caligula36]

A USP should eat just about anything you feed it. I don't know what Oak Tree is. Do they sell underpowered reloads?

Agree, my USP is a garbage disposal!

Maybe try a different mag if they have a compatible one at the range? Rule out the easiest fix first, especially as there should be no worn out springs anywhere on that gun.

[Rivers]

Change out the magazine springs with Wolff +10% magazine springs. Since you have 10 magazines, get the 10-pack. That should resolve the feeding issue.

[Scotty]

But isn't the last round the easiest to strip

And that is also why mag issues typically occur on the first and last round. Sometimes it doesn't have enough power to lift the round and ends up nose diving.

[highpower]

Lots of good points being made here. I just have a regular old USP 45 and it eats anything I put through it with no hiccups whatsoever. The Issues you describe are pretty much always going to be magazine related.

My first question is; Are the mags genuine HK? Generally speaking I have an abiding distrust of aftermarket magazines and while I will still try the occasional aftermarket magazine from time to time, factory magazines are my favorite.

Second question is have you taken the malfunctioning mags apart and cleaned them out and/or tried new springs? If I were in your position, I would buy some new springs and try that before I started looking elsewhere.

[Ruber]

New HK USP .45 Expert - jamming on last round?

Now, my question. If the weapon is jamming on the last round with some consistency, does this indicate a magazine issue?? Bear in mind, this gun is brand new. ~150 rounds through it.

Clean, lube, shoot, repeat. Make sure to include the mags. Mine took about 500 rounds to settle in (it will take you longer with 10 mags).

No HK springs should be worn after 150 rounds. Extra power springs only mask the issue, not fix it.

[DrJeds44]

Last round only, try a different magazine.

[SoftHeart]

Here is discussion on the HK Pro Forum touching on similar issues.

FWIW

https://www.hkpro.com/threads/magazine-spring-issues.209242/#post-1592618

[walmart_ar15]

It maybe your extractor spring is too strong being new and your mag spring is too weak on the last round to push it up into the breech face.