Shoot your other HKs and see it is a problem. I've never had issues with it and I left it alone.
Besides the trigger work, my another standard modification is to shorten / refinish the slide stop levers. You didn't say if yours are DA/SA or LEM; mine are LEM so I had a 4.1 parts installed too.
Besides the trigger work, my another standard modification is to shorten / refinish the slide stop levers. You didn't say if yours are DA/SA or LEM; mine are LEM so I had a 4.1 parts installed too.