HK USP springs?

[USP]

Anybody gone custom or changed the spring rate in their USP 9mm? If so what weight did you go with? Spring source? I am thinking bout rebuilding mine with a match trigger as well. Is the trigger upgrade a noticeable improvement? Currenty my USP is out of action..a cursed squib round jammed the barrel..and we couldnt get it out...so its been sent off to a gunsmith for the drill....meanwhile seems like as good as time as any for parts...

 

[capp325]

Anybody gone custom or changed the spring rate in their USP 9mm? If so what weight did you go with? Spring source? I am thinking bout rebuilding mine with a match trigger as well. Is the trigger upgrade a noticeable improvement? Currenty my USP is out of action..a cursed squib round jammed the barrel..and we couldnt get it out...so its been sent off to a gunsmith for the drill....meanwhile seems like as good as time as any for parts...

Match trigger is not a drop-in unit. To get trigger pull that is comparable to guns that come with stock match triggers, some relatively major work needs to be done. Make sure your gunsmith what he's doing. Also, why do you want to alter the spring rate? A lighter spring is likely to accelerate wear while a heavier spring could cause misfeeding. You only need to change the spring rate if you want to tune the gun to work with a particular type of handloads (i.e. reduced power loads for competition use). Unless that is the case, I'd trust HK engineers' choice and stick with the stock spring.

 

[USP]

I heard at my club a couple of people had altered their springs (lighter) for IPSC and had good results...havent tried the guns they are running so not sure...

 

[NaOH]

I put the Match trigger in my USP. Better but not worth what it cost me.

 

[USP]

what sort of cost was the trigger upgrade?

 

[maurice]

Important to note that there are two hammer variants in newer and older USP's. The new style catch only works safely with the new style hammer.
SO, if you get a match trigger kit, and it has the new hammer, you MUST use the new catch. It does make a difference. When my Custom SPort was new, the trigger would not reset properly (trigger return spring was softer, and had some plastic shavings around the trigger that had to be removed, should have been done at factory)
If you are going to use this in production, you can not change the springs for aftermarket ones. The OEM springs last a long time, but you should replace firing pin spring (depending on dry-fire as well) every 10,000 rds. I have been told the recoil spring should be replace every 20,000rds (?) . Never heard of an extractor spring going, but if you have it apart......!
Mag springs shouldn't give you a problem, but the followers should be checked over,as they develop chips in them.