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LEM Swap Problem/Help

2512 Views 20 Replies 3 Participants Last post by  HollowPoint
I have a USP Tactical date code AG that I did an LEM swap on years ago. Works great. I'm now doing an LEM swap on a USP 9 date code KD. The catch and control latch are a lot different on the 9 compared to the Tactical. Now that it is all assembled, the hammer does not pre-cock. It's essentially double action only. Did I do something wrong? Is the old catch/latch assembly not compatable with the LEM trigger? Can I get a new catch and latch to replace the old style and make it work?

Thanks for any and all help!
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Post a pic of the right side of the frame where the hammer axle is. Did you install the hammer axle correctly?

All pre-KF USP's will need some modifications to the frame for LEM conversion, among other things.
Did you or someone else modify the frame to allow the fitment of the LEM hammer axle? If no modification has been done to the frame, I'd really like to see a pic of the frame as stated in an earlier post.

Unless you're keeping the DA/SA safety/control lever.
Some of the steps in this tutorial may have changed but it should help you figure out how to post pics. Or just email the pics to me and I'll post it for you. PM me for my email if you wish.
Are you or are you not using the new-design hammer strut?
You need the new hammer strut. If you're buying from HKParts, they have the wrong description on the old hammer strut. It is NOT the new-style strut.

ETA: Use the hammer strut that came with the other gun (USPt) and see if it solves your issue.
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