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Dude, if you spent even 5 minutes searching for aftermarket parts, you would have realised there are TONS of aftermarket slides for HK45. There are aluminum ones, there are two different SAI ones, I personally have the RA Tech steel one on mine. Nineball makes tritium sights if that's what you mean by "stuff that goes with a metal slide". As for recoil spring, upgraded recoil springs exist. Nineball makes them. I had to use the Nineball recoil spring as well as another smaller spring inside it, I needed the extra umph for my steel slide.
The only thing not ambi on the HK45 is the safety. Slide release and mag release are ambi.
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