New FNP9 not locking back

New FNP9 not locking back

This is a discussion on New FNP9 not locking back within the Defensive Carry Guns forums, part of the Defensive Carry Discussions category; While manually cycling my new FNP9, I noticed it doesn't always want to lock back on an empty magazine (at least 2 of the 3 ...

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Thread: New FNP9 not locking back

  1. #1
    Member Array Cdknox's Avatar
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    New FNP9 not locking back

    While manually cycling my new FNP9, I noticed it doesn't always want to lock back on an empty magazine (at least 2 of the 3 I have). Are the mag springs maybe a litte weak, or is the slide lock back maybe a little stiff? Looking inside, it appears the magazine just doesn't push the catch up far enough. Will FN send me more powerful mag springs?


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    VIP Member Array Rollo's Avatar
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    Quote Originally Posted by Cdknox View Post
    While manually cycling my new FNP9, I noticed it doesn't always want to lock back on an empty magazine (at least 2 of the 3 I have). Are the mag springs maybe a litte weak, or is the slide lock back maybe a little stiff? Looking inside, it appears the magazine just doesn't push the catch up far enough. Will FN send me more powerful mag springs?
    If the gun/mags are new I would call FN to see what the warranty process is. You could probably just send the mags back and they would send you new ones.
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    Most new mags need a little tuning. I would compare the feed lips on the ones that don't work to the one that does and see if the are a smidge tighter.
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    The FNP-9 & the FNP-40 were reportedly both having problems with weak magazine springs. So I would get that problem rectified by any means possible.
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    Contact FN asap.
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    Senior Member Array WoodLark's Avatar
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    Back when I first got my FNP-9, I had the same problem. Based on advice I received at the FNH forum, I locked the slide back manually and left it that way for two days. The problem disappeared! (YMMV)
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    Member Array scott314's Avatar
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    What is the test fire date? I got a "new" FNP9 in 2008 that was test fired in 2006. Sometime between when my gun was manufactured and when I purchased it FN changed the follower design slightly to correct the problem you are describing. I made a call and a few days later I had 3 replacement followers that fixed me right up. Only problem I ever had with that gun.

  8. #8
    Member Array Cdknox's Avatar
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    test date was 2007 and was just bought new a couple weeks ago. Sat on the FN shelves for a while.

  9. #9
    Member Array ming's Avatar
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    The first time I shot my FNX-9 I had the same problem, slide didn't lock back several times. When I went home I loaded up several mags with 10 or so rounds and locked the slide back as well (as posted by WoodLark). They sat that way for a couple days. Haven't had the problem since then.

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    Member Array scott314's Avatar
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    Based on your test fire date I would call FN and see if you need the updated followers.

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    Member Array Ky Bob's Avatar
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    I bought a NIB FNP-9 last week and it has the same issue of the slide not locking back. I called Bob at FN and he says its a follower AND slide lock problem and it will have to go back for factory service.

    I asked for a couple of free mags for my trouble but he said no. Oh well, didn't hurt to ask and it's not like the mags cost them a fortune.

  12. #12
    Member Array Cdknox's Avatar
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    I finally got out to shoot it since I bought it in October (no time, financial reasons) and had it fail to lock back on 2 of the mags (I marked them.) I called FN and described this and they wanted the entire gun back. I know it's a mag problem on these two and not the gun as the 3rd mag locks back everytime. I really don't want to send the whole gun in. I wish they would just send me new followers to try, it would be cheaper for them. Gun however does shoot great!

  13. #13
    Member Array Ky Bob's Avatar
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    Well I think the guy at FN is right about it being a follower and slide lock problem. Here's a picture I took of my FNP-9 and you can see how short the slide lock is.



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    Member Array Cdknox's Avatar
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    Ive never seen strawberry jelly used as a lubricant! :)

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    Neither have I...maybe after a shooting session he may be due for a snack. Jokes a side that is an awful lot of lube.

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