I had one for my Firestar M40 - .40S&W and I currenly have one for my USP9C. The HKS loader functioned beautifully on the Firestar single column mags.
The USP9C is another story. The slot on the bottom dosen't quite hold the mag all that securely. It's not a big problem since I hold the loader so that the mag dosen't slip out. The BIG problem was that there was a stop for the lever that didn't allow the "pusher" to retract up far enough to feed another round in. After about a month of struggling with this, I just chopped the little stop off with an x-acto knife. Problem solved, no more difficulty.
IMHO, these things are a HUGE thumbsaver. It makes loading magazines a lot less of a chore.
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