I don't know if it's the case with the photo you referenced for the USP lever on the left, but on some of the HKParts lever photos, they're actually showing a right side (V4) lever upside down.
I don't know myself if the HK45c and USPc levers have the same slots for the internals, although Brownie indicates they do, but I've assumed levers have been different in the past when they weren't, when going off of the HKParts photos. (Specifically the V1 and V3 levers.) Again, if you look at the photos for the V1 and V3 levers, they look different, but actually aren't...it's a V4 upside down.
Compact photos from HKParts
V3 (Actually a V4 upside down)
Now notice the Full size lever photos, showing the levers correctly:
It's not. It's a USP lever. And I can't find the picture at the moment but I believe it was Jeray that had an HK45 lever on his USP leading me to my assumption that the levers are indeed interchangeable.
^ Ah ok TooSixy. I thought you may have been referring to the axle itself. The levers themselves are of course shaped differently. I had just posted that for clarity's sake, as I had mistakenly assumed at one point that one had to switch out the V1 for the V3 lever as well, when changing out the detent variant.
And Brownie, definitely a USP lever on that HK45, possibly the Compact lever. Good to know.
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