Changing hammer springs on HK USPc


January 21, 2003, 12:43 AM
Since there is no match trigger available for the USP compacts, I was thinking of just changing out the hammer spring just to lighten the pull up a little bit. THe pull (IMO) is smooth enough, just a tad heavy.
I guess the triggers are like new jeans that need to be broken in, I just wanna speed up the process but not change reliability.

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4 eyed six shooter
January 22, 2003, 01:21 AM
Changing to a lighter spring will lighten the pull and make it feel smoother. The pistol will smooth up itself in time as the parts wear in also. Just make sure you get 100% ignition with the new spring if you pistol is to be used for self defense. Don't go too light as you may make the gun unsafe and open yourself up to a lawsuit in an accidental shooting.
Good Shooting ;) John K

January 29, 2003, 06:39 PM
Yup, that's my fear. I'm not about to make any mods that will result in the gun becoming less reliable. I know the parts will break in and become smoother/ nicer over time. I learned that w/ my fullsize USP, I'm just a little impatient I guess...:rolleyes:

January 31, 2003, 12:28 AM
Try boosting the hammer. Unload gun, dribble some oil down onto the sear and as you pull the trigger (unload gun!), push the hammer lightly forward (on the unloaded gun). Do this 10 to 20 on the unloaded gun times and things will smooth up. Some brake cleaner blasted down the mechanism will clean it up when you're done.

Did I say "unload gun"?

February 6, 2003, 03:54 PM
you could always detail strip it and polish parts.

February 19, 2003, 09:09 AM

I emailed wolf gun spring corp and they replied that the springs sold for the full sized USP will interchange with the USPc. Unless you're using millitary ammo, you can probably get away with a slightly lighter spring rate w/o diminishing reliability. I will be trying this soon on my usp40c.

Boosting the hammer as has been recommended did help my trigger pull smooth out a little, however, detail stripping the frame showes some areas where cleaning up parts should yield a greater increase in smoothness. I'm reluctant to touch these parts however and remove the magical, protective, super slick, finish. So the spring switch looks like a good compromise. If you go that route before I do, post about reliability with your chosen load.

I'll do the same when I can.


February 20, 2003, 04:10 PM
I've changed springs out in my competition guns, but I've kept my house guns stock...why mess w/ something that works right?
Honestly tho, th rounds I've put through my USPs, I've gotten use to the triggers and I'm 100% happy w/ each one.

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