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Discussion Starter · #1 ·
Greetings!

First, thank you all for letting me in. I recently purchased a used BB dated USP 9 compact from my LGS. Took it home, cleaned and lubed before returning the next day to the range and shot 200 flawless rounds using WWB 115 gr FMJ. The only issue I have is when reloading. When I slap the fully loaded (10 rd) mag. the slide would slam and go into battery. It does not happen when I push and click it into place, only when slapped/slammed the loaded mag in. I'm thinking the slide release spring maybe the culprit and found one on HKparts. Any other ideas? If it is the spring, it looks pretty intimidating to replace. Any tips? Thanks again.

KATOM
 

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Greetings!

First, thank you all for letting me in. I recently purchased a used BB dated USP 9 compact from my LGS. Took it home, cleaned and lubed before returning the next day to the range and shot 200 flawless rounds using WWB 115 gr FMJ. The only issue I have is when reloading. When I slap the fully loaded (10 rd) mag. the slide would slam and go into battery. It does not happen when I push and click it into place, only when slapped/slammed the loaded mag in. I'm thinking the slide release spring maybe the culprit and found one on HKparts. Any other ideas? If it is the spring, it looks pretty intimidating to replace. Any tips? Thanks again.

KATOM
Not 100% sure on the USP compact, but every full size USP and Mark23 I've used does this.
 

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To me this is normal. All my HK handguns do it and some others do it too. I like the feature. Time saving and one less step to worry about. If I'm slamming in a mag I'm planning on using it so having it already to go is a plus in my book.

Also, use the search function. This has been discussed. I even think it was yesterday.

Welcome to the site
 

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I got a USPc 9 as well and it does this. In fact, all my HKs do it when you slam the mag hard enough. Some require a little more force than others but perfectly normal. Enjoy!
 

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Discussion Starter · #7 ·
Thanks for the prompt responses. I guess since I'm new to HK I didn't know that it's a common occurrence. I have other polymers and steel/aluminum framed handguns and don't normally see it happen every time I reload. Glad to know. Good thing there is a striker block safety. :) Also, just saw a vid of the complete disassembly. "Looks" easy. Thanks again guys!

KATOM
 

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its in the manual that it can occur, some even call it a feature!!
 

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It happens on my USPc .45 SS pretty regularly. Enough that I try to be cautious in going through my complete MOA for reloading and not depending on this "auto feature" that most of us experience with the H&K's. I've also had it occur, although less frequently on the non H&K pistols.
 

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Some stupid physics law about force, mass in motion, and mass at rest. Your slamming the mag home, the pistol moves, and the slide lock doesn't so it releases the slide. Even my well worn Beretta does this also but not Glocks with their light stamped slide lock.


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I hate when pistols do it and I try to avoid it. It happened once and it didn't strip a round. Click!

During competition if it does it I usually rack again, that fresh round flying is for the homies who couldn't be here.
 
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