after market hk magazines

That's like putting chinese tires on a Porshe.

 

I've never been able to find cheaper than CDNN on HK mags...

HK USP Fullsize 45acp 12rd Mag w/Finger Rest New Factory

And, I've never seen an off brand mag for HK. And, I've looked, maybe not well enough.

 

Not sure if the neutered 10 round version would interest you, but for 25 bucks, not a bad price.

HK USP Fullsize 45acp 10rd Tactical Mag w/Finger Rest New Factory

 

For Sure!!! I bought one for my USP and don't care for it as much as the factory mags.