USP 40 duty ammo reliability issues - Page 2
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Thread: USP 40 duty ammo reliability issues

  1. #11
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    Quote Originally Posted by DarkeWolf View Post
    ...Just to break all those springs in. Probly middle weight, like 180gr...
    That's what my friend did with his USP40. Did a tune-up like the OP, and ran about 300 rounds of 180gr FMJs for break-in. Now, it works like a champ with SD JHP rounds. I shot it 2 weeks ago using Hornady and Gold Dot 180's. Real smooth, no hiccups. I'm thinking about having my friend tune-up my 40.

    And if all else fails, there is always HK CS.
    Last edited by Vincent04; 01-15-2019 at 11:27 AM.

  2. #12
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    I am assuming the pistol and magazines are clean, properly lubricated and function correctly and the parts and installation are correct. Since you have modified the pistol and have new springs you will need to break-in (set the springs) 200-500 rounds. The break-in period will be different than when the pistol was new. Since the pistol functions properly with FMJ ammunition the HP ammo may not be compatible or the springs need to set (wear-in or break-in). Not all ammunition will work in all pistols, common issues are weak-charge or bullet design (truncated cone or flat point). You were concerned about the magazines being loaded for years, this is not a problem as the USP has modern spring steel and was designed for heavy use. Since the magazines are used and have new springs you will need to function test them.

  3. #13
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    Since it sounds like you have co-workers with the same model pistol, I would say that it would be easiest, to test the mags, by running them in a pistol that's working.
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  5. #14
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    Quote Originally Posted by Vincent04 View Post
    But did you make changes to your USP like the OP did?
    No, I did not.

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    I'll have to stick with the break in plan for now...that should be the culprit. If that doesn't work I'll scoop up a couple new magazines, they're cheap on HK specialist right now.
    "Do not go gentle into that good night...rage, rage against the dying of the light." - Dylan Thomas

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    Sounds to me like the magazine(s) aren't presenting the rounds properly. As stated above, I'd check with someone else's magazines and try yours in someone else's gun. If that doesn't solve it, send both gun and magazines to H&K.

  8. #17
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    My USP 40 is from 1996. Never an issue. My best friend was INS and ran the qualifying range in the area for all LEO. Prior to 911 I could use the range with him. Tons of duty ammo ran through mine. All my USP are the only weapons that I've never had any failures with. Never have had to replace a single part. Even when I installed a threaded barrel, it dropped right in and shot beautifully with any spring changes. So many people say you have to change the spring, but HK says no. Luv my USP40. First pistol I bought when I set foot stateside.

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    Quote Originally Posted by Skeletor87 View Post
    If so were you able to find a reputable duty load that worked will in your USP?
    Affirmative!!

    Have run Winchester 165-grain Ranger T-series, Winchester 165-grain Ranger Bonded, and Winchester 165-grain PDX-1 Personal Defense (which I believe uses the same bullet as Ranger Bonded) each in excess of 400 rounds with zero malfunctions in a USP40 full size. This was tested using 16-round USP Expert magazines downloaded to 15 rounds, with the metal baseplate replaced with the plastic one, which is far more comfortable in my hands. I use Winchester 165-grain Full Metal Jacket for practice to keep consistency with the defensive ammunition.

    If you really want the ultimate in weapon reliability, send your upper slide/barrel assembly to Robar, and have the barrel and recoil spring assembly coated in NP3 Plus nickel Teflon. This will notably enhance the feeding and cycling characteristics of the weapon regardless of the ammunition type chosen, and I cannot recommend this highly enough. Also tell them to polish the breech face in the slide, which helps to enhance the feeding and ejection.

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    Finally got out to the range last week. I ran 125 rounds of pretty hot 170 gr fmj rounds through my USP40, then 40 rounds of Hornady Critical Duty 175 gr. It ran great, so it most likely was the freshness of the new recoil spring. My next trip I'll run some more of that 170 gr fmj and then try out more of the 180 gr HST that I've got (which is what I would like to have as my defensive load). I'll update the post after trip 2, but I do appreciate the advice that you guys have offered me in the meantime.
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    Quote Originally Posted by Skeletor87 View Post
    Finally got out to the range last week. I ran 125 rounds of pretty hot 170 gr fmj rounds through my USP40, then 40 rounds of Hornady Critical Duty 175 gr. It ran great, so it most likely was the freshness of the new recoil spring. My next trip I'll run some more of that 170 gr fmj and then try out more of the 180 gr HST that I've got (which is what I would like to have as my defensive load). I'll update the post after trip 2, but I do appreciate the advice that you guys have offered me in the meantime.
    Good to hear the new spring is running the gun good now, new springs do wonders, keep us posted, thanks for sharing!

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