Just added my first HK to my collection a USp 45 stainless slide with a KH date of birth. The gun is in fantastic shape and by the looks has had very few rounds through it. My first question is can I replace the the recoil spring with a newer design or do I need to find the older design. Second I understand the firing pin has changed since this USp was made in 1997 any need to upgrade the original. I have Sigs Fn's and Glocks this is my first HK and by the way it performed during my first range trip it will not be my last. Thanks in advance for any info.
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