I haven't done a lot with the USP, as I purchased it towards the end of last airsoft-season, and it had issues with the hop-up that required it to be sent in for repairs. Just pulled it back out, cleaned and lubricated it, and for some reason the slide-stop is half-engaging every 8 or so shots. I've checked my grip, made sure I'm not limp-wristing the replica (though the recoil is so slight that shouldn't matter), and checked to make sure it's not just the magazine.
The slide stop isn't fully engaging, it's about half-way up on the notch, and is causing the notch to round out a very slight amount, so I quit putting rounds through it to test. It's as if the recoil is causing the stop to bounce just enough to catch the slide and keep the replica from cycling.
Anyone had a similar issue?
Edited by Guilo, 29 March 2013 - 04:30 PM.