Posted: 10/1/2005 3:27:36 PM EDT
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Recently bought a USP 9mm from the EE. Appeared to be in excellent shape and came with two 10RD and two 15RD mags. The 15RD's are pre-ban, not new manufacture. None of the magazines will lock open the slide after firing the last round. Manually racking the slide with an empty mag (both 10 & 15) will result in the slide staying open. Any ideas? Hoping this is a magazine problem. Have read about Wolf 110%(?) replacement springs. After having purchased four Glocks (all used with zero problems), branched out and added the H&K to the inventory. Shoots very accurately, but slide issue has been a disappointment. Any thoughts/ideas/fixes to this problem would be greatly appreciated. Thanks! Edited 10/17/05: Looks like operator error was the problem. STLRN, thanks for the advice. My big fat thumb was resting on the end of the slide release lever, preventing it from engaging. |
| While spring problems are common with the USP .45, they seem less common with the smaller calibers. The 9mm in the USP is taking the USP to its lower limits. The USP was designed around the .40 then the slide lightened and recoil spring lightened to work with the 9mm, unlike the Glock which was designed around the 9mm then they had to beef up the frame to work with the .40 without failure. Because the USP is oversized for the 9mm, almost anything that absorbs slide velocity can cause the slide to short cycle. Not short cycle enough to cause a misfeed, but short cycle enough to keep the slide from locking open after the last round. If you tighten your grip and make sure you are not limp wristing the 9mm USP and it still fails to lock back on the last shot, then I suspect the springs are the culprit also. If however, once you tighten up your grip more and then the slide starts locking back then you have found your problem. The 9mm in the USP recoils so little that it is easy to relax your grip just enough to cause the slide to short cycle just a hair. Not enough to misfeed as I said, but enough to prevent the slide from full rearward travel which will make it not lock back after the last round. |
+2 One of my .40 mags was failng to lock open. The wonderful minds here at ARFcom pointed me in the direction of Wolff springs and the problem was fixed. If I recall correctly, that was my first post on the site...ahh, the memories. |
