[Cheeseburger]

What's the difference compared to regular recoil springs?

Are they compatible with usp's?

Are there benefits?

 

[PaulC]

According to HKParts, they are different.

"New HK USP 9mm Tactical Recoil Spring With Buffer Assembly Complete. Great spare or replacement item to have as a spare. This is the factory part. This recoil rod assembly was designed to be used for heavy use with a sound suppressor attached."

However, I haven't heard a concrete answer to how they are different.

http://www.hkpro.com/forum/hk-handgun-talk/119356-usp-tactical-recoil-spring-vs-regular-usp.html

I can see how a heavier slide along with a suppressor may require a weaker spring.