I bought a BHP in 9mm at a gun show some time in the 80's. The hammer and slide were hard to operate,,harder than my 1911 so I researched the web and found an old blog with a lot of info. From this I decided to lighten the hammer spring with a 26lb from Wolf Springs. The factory spring can be difficult to compress on the hammer strut so I got a spring removal tool from BHSpring Solutions which makes the swap out very easy (if you are a self taught MR FIXIT like me ). The lighter spring gave me a lighter hammer pull back and easier slide pull as well. I even felt a slight reduction in trigger pull but that could have been my imagination as my trigger weight tool is packed away (I am in the middle of moving). I did nothing else and tested the hammer fall on both foreign and USA made ammo,,,No light strikes. I dont plan to use my HiPower 9 in competition but as recreational shooting. I have not changed the factory recoil spring or firing pin spring. I have read much about reciprical consequences but I dont shoot this pistol often but plan to use it as one of my go to carry pieces along with several other older handguns,,all made years ago,,,my S&W Model 10 being my favorite. I just wanted to offer some new BHP owners who have an older MKIII an inexpensive fix that works for me. Safety first always.