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Page Handguns » H&K
Posted: 9/7/2010 5:14:24 AM EDT
Is there an easy way to tell if an older (94) HK USP 40 recoil springs need to be replaced?

The older HK USP I just bought seems very snappy, and I am wondering if I need to replace some springs or something.
Link Posted: 9/7/2010 6:25:40 AM EDT
Sometimes they eject brass violent and far away if weak on the recoil spring. Test it with the weaker ammo like White Box.
Link Posted: 9/7/2010 4:01:28 PM EDT
The recoil springs on HK USPs are good for at least 10K, but since you bought used you have no way of knowing how many rounds are through it. The .40 is a snappy little cartridge but is generally quite well behaved in the USP or USPC. If your pistol shows evidence of a lot of wear on the barrel and chamber hood, replace ONLY the outer recoil spring, not the inside one. Wolff sells them or you may get one from HK or HKParts.net.
I have never had to replace a recoil spring yet and my most shot pistol, my carry USPC 45 has 12K on it now and is still going strong. So if your pistol looks like it has not been shot much, then it very likely does not need the recoil spring replaced.
Link Posted: 9/7/2010 6:16:29 PM EDT
[Last Edit: 9/9/2010 7:54:44 AM EDT by ChickenDaddy]
Here is a few shots of the hood and barrel wear and recoil spring assembly...pretty apparent wear, but since it's my first HK, and used...not sure if it's a lot. But by the external condition of the gun, and these smilies, it's been shot a lot. Is there a measurement r something for the spring to tell if it's in spec?


Link Posted: 9/7/2010 8:20:24 PM EDT
That does not appear to be excessive wear.

USPs wear fast on the barrel and locking block. They will start to wear from the extractor after just a hundred or so rounds.

Even the pictures of the disassembled guns in the manual look like that. I'd just shoot it, you'll get used to the recoil.
Link Posted: 9/7/2010 8:53:32 PM EDT
[Last Edit: 9/7/2010 8:56:27 PM EDT by DoctorNo]
Another approach:

Purchase a new recoil spring. See if there's a measurable difference between the two. If the new spring is over an inch longer than the old one, I'd trash the old one. If it's still in good shape ... you have a spare for down the road.

I do the same with AR15 buttstock springs.

ETA: You're missing the front recoil spring retention plate and C retaining spring. The recoil assembly is normally captured from the factory. It won't hurt anything to run it the way you have it, however.

Doc
Link Posted: 9/8/2010 4:46:31 AM EDT
The inner spring is captured on this USP...but the outer is not, so I think the larger, outer spring beng non-captured is proper. It's even that way in the manual.
Link Posted: 9/8/2010 8:03:58 AM EDT
Originally Posted By ChickenDaddy:
The inner spring is captured on this USP...but the outer is not, so I think the larger, outer spring beng non-captured is proper. It's even that way in the manual.


You are correct, the inner spring is captured. You are wrong on the outer spring. In ALL USP's the outer spring is captured by a c clip that goes on the end of the recoil rod and holds on the recoil spring plate. The manual shows an exploded view of the pistol ... hence why the spring is shown off the recoil rod.

Doc
Link Posted: 9/8/2010 10:52:40 AM EDT
The outer spring was not captured on early USP pistols. His is a 94 and you cannot get much earlier than that, so it is normal for his pistol to not have a captured recoil spring.
This is what I would do because your pistol does look to have a bit of usage.
It will cost you about $70 but order a new recoil spring guide assembly. It will have both springs captive which makes cleaning so much more easy, and you will get a new spring assembly.
And that new assembly will drop right in, no hassle.
Link Posted: 9/8/2010 10:54:34 AM EDT
[Last Edit: 9/8/2010 10:55:21 AM EDT by RapidRaft]
The first year that HK produced the USP, 1994, they did not have the large recoil spring retained to the guide rode with a c-clip.

Upgrades to the design in 1995 included the retained recoil spring, among other things.


ETA: Beat!
Link Posted: 9/8/2010 2:55:59 PM EDT
I stand corrected by the experts.

Doc
Link Posted: 9/8/2010 6:33:50 PM EDT
Originally Posted By Big-Bore:
The outer spring was not captured on early USP pistols. His is a 94 and you cannot get much earlier than that, so it is normal for his pistol to not have a captured recoil spring.
This is what I would do because your pistol does look to have a bit of usage.
It will cost you about $70 but order a new recoil spring guide assembly. It will have both springs captive which makes cleaning so much more easy, and you will get a new spring assembly.
And that new assembly will drop right in, no hassle.


Should I contact HK for that part?

Link Posted: 9/8/2010 7:07:19 PM EDT

Originally Posted By ChickenDaddy:
Originally Posted By Big-Bore:
The outer spring was not captured on early USP pistols. His is a 94 and you cannot get much earlier than that, so it is normal for his pistol to not have a captured recoil spring.
This is what I would do because your pistol does look to have a bit of usage.
It will cost you about $70 but order a new recoil spring guide assembly. It will have both springs captive which makes cleaning so much more easy, and you will get a new spring assembly.
And that new assembly will drop right in, no hassle.


Should I contact HK for that part?


You can either call them or buy it from here - http://www.hkparts.net/shop/pc/Recoil-Rod-Assembly-USP-40-S-W-199p1458.htm

HK might tell you to buy it from HKparts.net anyway.
Link Posted: 9/8/2010 8:16:15 PM EDT
The USP was built to handle the .40 which is a snappy round to begin with. From the pics you've posted you don't have any excessive wear that I can see. HKs are if anything, overbuilt. Take it to the range and get used to it. You've got a pistol that will generally out last its owner. I know all of my HKs will.
Link Posted: 9/9/2010 7:53:10 AM EDT
[Last Edit: 9/9/2010 7:53:54 AM EDT by ChickenDaddy]
I shot it again yesterday with various weights, and used my shooting gloves. That seemed to help. It's not uncontrollable at all and shoots very accurately. I just have bad wrists. So I'll probabbly just shoot it.

If I add any money into it for night sights that glow or parts, i won't be able to eventually sell it and upgrade to a P30.
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