New SP01

[Terry G55]

Was shooting my new SP01 for the second time, only shot 150 rds, no ftf.  but the slide didn't lock back at the end of the mag.  It happened every time, through 9 mags.  I only have two magazines so it is either:

1.  Something wrong with both mags
      slide locks back when manually pulling the slide back with empty mag in magwell
2.  Something wrong with slide:
      slide locks back when manually pulling the slide back with empty mag in magwell
3.  Grip putting pressure on the slide release not allowing slide to lock back:
      thumb is below slide release
4.  I have an 11 lb recoil spring in place.
5.  HELP

Other then that this is one amazing pistol, the biggest issue I have is that it keeps hitting where I'm pointing and not where I'm aiming but getting better, would post pics of targets but haven't figured out how yet..

Thanks in advance
Terry G

[bozwell]

What ammo were you shooting?  Also, check to make sure there's no grit/gunk restricting the slide stop's movement.  It could be the magazines as well, or it could also be the slide stop spring.

[carharttfarmer]

do you ride the safty with your thumb? if so you might also be barely touching the slide stop (this is what happens with my grip) also i have to put a tiny bit of oil on the slide stop for mine to work all the time

[Terry G55]

I was testing out different manufacturers, changing grain weight to see what I and the pistol like the best.

I will check the spring

I don't have a safety on the pistol, it is a decocker model. 

[gunguru]

Your gun is ok as the slide lock back manually, so it's something in the shooting sequence...  is it your first pistol or your first pistol shooting experience?

My guess...

1.  Your gun may be dirty or greasy.  Do you clean it fully before shooting?
-- Solution: Fully clean the slide and frame assembly to remove all grease and other.

2.  Your gun is not well lubricated.
-- Solution: Fully degrease and clean, and put little oil on all part, and few drop in slide/frame rails.

3.  Your ammo is too weak.  Not enough pressure to work properly.  Do you reload?
-- Solution: Try good factory ammunition, like WWB, AE, or similar.

4.  Your stance is weak or sloppy, so your arm absorb most of recoil energy, and the slide miss some.
-- Solution:  Fully extand your arms, and lock your elbow.

5.  Your thumb touching the slide or slide release (even just a little), it's may be enough to slow the slide and not alloing the slide to lock.
-- Solution: Make sure to not touch the slide with any fingers.

Remember, the slide have to get fully to the back in order to lock on a emply mag.  When firing, this movement is done on recoil energy, so any loss in this energy will slow the slide, and the slide may not be able to fully move to the back, even few thousand of an inch may be enough to not lock properly. 

I'm pretty sure your gun an mags are OK as when you did it manually, you bring the slide fully to the back and it lock properly.  So it have to be something happening during the recoil sequence slowing down your slide movement.
 

[Terry G55]

First pistol, but not first experience.  1st time shooting in 24 years, different grip/stance (old one was "weaver"),

cleaned and oiled weapon when received and after use.

will look at left thumb it could be touching,

not reloading, shooting blazers, upc and some other brand I don't remember

not sure about stance being weak or sloppy, didn't consider stance as an issue will load singles in mags next time at the range and see if stance/grip is problem,

Thanks for the assistance

[gunguru]

Just make sure to fully extand and lock your arm, just to be sure your arm doesn't absorb the energy.  I suspect for sure something slowing your slide.

And it can't be a malfunction as it lock manually.

[1SOW]

gunguru:

And it can't be a malfunction as it lock manually.

I'd humbly add one proviso:  a "wrong/bad recoil spring" for the ammo strength can cause exactly that.

The stance and grip are good ideas to check.  The proverbial "limp wrist" can be caused several ways other than just weak hand shooting. 

[Terry G55]

using an 11 lb recoil spring it should be weak enough not to stop the slide from coming all the way back.

was just installed and seems a little long, causing a small bend in the recoil spring guide, but when manually pulling back on the slide it is definitely easier then the original 18 lb spring..

will try all kinds of different things when I get to the range next weekend..

Thanks

[Oneiric]

Where'd you get the recoil spring from?

I highly recommend David's stuff from CGW. Great quality and also amazing customer support.


-Oneiric

[coolbox]

Two prime reasons, already posted above, are

1. weak recoil spring, as then the slide is just too fast (or ammo too hot for the spring) to lock back. also, you could have a weak slide stop spring. try going back to factory recoil spring to get this one sorted.
2. thumb riding the slide stop. Try shooting single hand to sort this out.

Other than these, it is just the mags.

[Terry G55]

Spring was from CZ Custom,

Will try all of these next weekend..

[czechyoself]

My .40 and 9mm will jam if I weak arm them on occasion. I got in a bad habit of doing that by using a laser. Instead of fully extending and locking my strong side arm, I had it slightly bent and was looking over the gun at the laser dot on the target. Once I figured that out, I stopped aiming that way, fully extended and locked my arm, no more problems.

My CZ's are picky with recoil energy, they require almost all of it to cycle that slide. If you're soaking it up limp-wristing or using an uncommon stance, it may be causing your problems. For me they would fail to feed reliably without my elbow locked.

[Jay Dee]

Not sure if your mags are factory mags, but I recently bought a used mag with a follower that didn't have a notch to lock back the slide on the last round. It's a stretch, but if this happens regularly, it is worth checking.