The Firing Line Forums

Go Back   The Firing Line Forums > Hogan's Alley > Handguns: The Semi-automatic Forum

Reply
 
Thread Tools Search this Thread
Old September 8, 2019, 02:34 AM   #1
MrBot
Senior Member
 
Join Date: September 29, 2013
Posts: 109
Shield Fails To Lock Back On Empty Chamber

I put about 200+ rounds of various ammo through my new S&W M&P Shield 9mm & the only malfunction was its failure to lock back once & that was on the very 1st mag. I went to the range y'day & 4 out of 8 mags I got a failure to lock-back. ..just wondering if this is common with the Shield & if maybe it should be sent in to S&W? The gun is very clean & lightly lubed. And, no, I don't limp wrist it. The hg has never jammed.
__________________
[If you tell the same lie enough times people will eventually believe it. Joseph Goebbels

You are not ready for meat--you are still on the bottle. Stacy Washington: aka, Stacy On the Right]
MrBot is offline  
Old September 8, 2019, 07:41 AM   #2
Walt Sherrill
Senior Member
 
Join Date: February 15, 1999
Location: Winston-Salem, NC USA
Posts: 6,346
If it only happens with SOME magazines, it's probably a mag issue, not a gun issue.

How many magazines are involved? If just two or three, it may be one problem mag issue, and you're hitting the problem with the same mag (or mags).
  • Just checking to see whether an empty mag will engage the slide stop and hold the slide open when the slide is racked would be a good first step.
If it wasn't happening with a NEW gun, I'd suspect weak mag springs -- but that usually happens later in the mag life. (If you've disassembled the mags, be sure that the spring is installed correctly and supports the front of the follower -- there's a diagram in the user's manual.)

If you're using more than two magazines, marking them on the bottom with tape will help you identify a problem mag.
Walt Sherrill is offline  
Old September 8, 2019, 07:52 AM   #3
expendable
Member
 
Join Date: September 18, 2009
Posts: 40
With small guns it’s easy to bump the slide stop with your thumb during recoil.

Like Walt said put an empty magazine in the gun and pull the slide back to see if it will lock open.
expendable is online now  
Old September 8, 2019, 11:55 AM   #4
MTT TL
Senior Member
 
Join Date: October 21, 2009
Location: Quadling Country
Posts: 2,670
I find brand new guns of all types suffer various weird malfunctions. Some of this has to do with various packing greases, anti-rust preventatives and excess lubricants on the weapon and some has to do with new parts that maybe were not cut 100% correct.

Even if your Shield was test fired at the factory they likely did not use the same magazine that came with the gun.

If it only happened once and on the first magazine I would not let it bother me at all. IF it continues to happen it would be worth looking in to.
__________________
Thus a man should endeavor to reach this high place of courage with all his heart, and, so trying, never be backward in war.
MTT TL is offline  
Old September 9, 2019, 05:49 PM   #5
Kreyzhorse
Senior Member
 
Join Date: April 12, 2006
Location: NKY
Posts: 12,295
Sounds like a mag issue. How many mags are you using? If you only have one, it's worth trying another one to rule out it being a gun issues vs a mag issue.
__________________
"He who laughs last, laughs dead." Homer Simpson
Kreyzhorse is offline  
Old September 9, 2019, 06:45 PM   #6
JDBerg
Senior Member
 
Join Date: May 18, 2015
Location: PRC
Posts: 1,619
Quote:
Originally Posted by expendable:
With small guns it’s easy to bump the slide stop with your thumb during recoil.
Big-handed folks shooting small guns often bump the slide stop with their thumb knuckle, so the slide often doesn’t lock back on an empty mag. Ask me how I know this!

When I shoot Glocks, this never happens to me, even with the subcompacts. My HK’s, and my Walther PPS-M2 can do this from time to time.
__________________
Words to Live By: Before You Pray - Believe; Before You Speak - Listen; Before You Spend - Earn; Before You Write - Think; Before You Quit - Try; Before You Die - Live
JDBerg is offline  
Old September 20, 2019, 10:09 AM   #7
seanc
Senior Member
 
Join Date: December 28, 1998
Posts: 341
Do you shoot thumbs forward? It might be you and could be a slight training issue. I do this too on my Glock and Shield. I slingshot reload anyway, so it doesn't bother me that much.
seanc is offline  
Old September 20, 2019, 10:20 AM   #8
T. O'Heir
Senior Member
 
Join Date: February 13, 2002
Location: Canada
Posts: 11,931
You give it a bath before shooting it the first time? All new firearms require cleaning before shooting.
Isn't likely to be a mag issue with 4 out of 8 failing. It's not clean after 4 to 8 mags either.
"...weak mag springs..." Springs do not lose temper from being used.
__________________
Spelling and grammar count!
T. O'Heir is offline  
Old September 20, 2019, 10:41 AM   #9
2damnold4this
Senior Member
 
Join Date: August 12, 2009
Location: Athens, Georgia
Posts: 2,451
I agree with the folks that mention the possibility you might be hitting the slide stop. You could shoot it with your left hand and see if the problem goes away.
2damnold4this is offline  
Old September 20, 2019, 01:06 PM   #10
Walt Sherrill
Senior Member
 
Join Date: February 15, 1999
Location: Winston-Salem, NC USA
Posts: 6,346
Quote:
Originally Posted by T. O'Heir
...Springs do not lose temper from being used.
As a general rule, you're right -- but springs CAN fail from being used, and with some magazine designs (mostly hi-cap mags), mag springs or even recoil springs can also fail over time by being kept fully compressed for long periods. (Most fully-loaded mags don't fully compress the mag springs, but a few do.) That's why Wolff Springs recommends, as a general rule, that you download high capacity mags a round or two if they're going to be stored loaded for long periods.

We know it's a new gun, but we don't know that all of the magazines are new. The original poster hasn't been back to offer any updates.
Walt Sherrill is offline  
Old September 20, 2019, 02:36 PM   #11
44 AMP
Staff
 
Join Date: March 11, 2006
Location: Upper US
Posts: 21,388
Before doing anything else, Do take a close look and be sure you aren't accidently (and unknowingly) bumping the slide release when shooting.

It happens more often than you might think, with some people and some guns.
__________________
All else being equal (and it almost never is) bigger bullets tend to work better.
44 AMP is offline  
Old September 20, 2019, 09:11 PM   #12
Seven High
Senior Member
 
Join Date: December 11, 2004
Posts: 613
You might try having another person shoot it. If they don’t have any malfunctions you will know that it’s your grip.
Seven High is offline  
Old September 21, 2019, 07:33 PM   #13
kymasabe
Senior Member
 
Join Date: June 10, 2005
Location: SW Florida
Posts: 2,409
Is it possible its ammo sensitive? My daughters bodyguard only functions properly with two or three ammo brands.
__________________
God's creatures big and small, eat them one, eat them all.
kymasabe is offline  
Old September 22, 2019, 10:09 AM   #14
Spats McGee
Staff
 
Join Date: July 28, 2010
Location: Arkansas
Posts: 8,248
Do you have an update for us, OP? I have a 9mm Shield and am curious as to what you figure out.
__________________
I'm a lawyer, but I'm not your lawyer. If you need some honest-to-goodness legal advice, go buy some.
Spats McGee is offline  
Old September 22, 2019, 11:11 AM   #15
Carl the Floor Walker
Senior Member
 
Join Date: June 3, 2017
Posts: 705
I do not own a Shield any longer, nice gun, but just preferred something else. But, just like a lot of guns, I would check out the condition of the slide lock spring, or the Magazine catch spring.
I have a feeling your issue is a easy fix. Best of luck.
Carl the Floor Walker is online now  
Old September 22, 2019, 11:53 AM   #16
Walt Sherrill
Senior Member
 
Join Date: February 15, 1999
Location: Winston-Salem, NC USA
Posts: 6,346
If it only happens on the last round with some magazines, it may be that some of the mags are the problem rather than the shooter's grip.

As noted earlier, numbering the mags would help the shooter to determine if only certain mags had the problem.

He can check that pretty easily by only loading 2-3 rounds per mag and firing away!

Last edited by Walt Sherrill; September 22, 2019 at 12:05 PM.
Walt Sherrill is offline  
Old September 28, 2019, 05:17 PM   #17
gsparesa
Member
 
Join Date: January 3, 2013
Posts: 54
When was the last time you completely cleaned the pistol and the magazines?
gsparesa is offline  
Old March 12, 2020, 02:08 AM   #18
MrBot
Senior Member
 
Join Date: September 29, 2013
Posts: 109
Wow! ..wasn't able to do much range time since my OP in September. Heck if I know why I, or the hg, had a bad day way back when. This little hg has been thoroughly clean & lubed a lot since I 1st got it new. I put a couple of hundred rounds of various ammo (mostly hp) through it since my OP & the hg has worked flawlessly. ..appreciate all the input & will keep these notes should I run into this problem in the future. As for now I'm happy.
__________________
[If you tell the same lie enough times people will eventually believe it. Joseph Goebbels

You are not ready for meat--you are still on the bottle. Stacy Washington: aka, Stacy On the Right]
MrBot is offline  
Old March 12, 2020, 04:07 AM   #19
Hal
Senior Member
 
Join Date: October 9, 1998
Location: Ohio USA
Posts: 8,422
I have an old FIE Titan/Erma Excam/Targa GT380.
It has a slide lock too that I never knew about until I ran some hotter than normal handloads.
Surprised me a bit.
Normal factory loads - no.
Anything loaded a bit hotter - locks every time.

I'd be curious to see if using +p had any effect.
However since it seems to have corrected itself - I might be tempted to chalk it up to teething pains.
Hal is offline  
Old March 12, 2020, 04:26 AM   #20
Spats McGee
Staff
 
Join Date: July 28, 2010
Location: Arkansas
Posts: 8,248
While I'm still curious as to what happened, I'm glad to hear that it's running right.
__________________
I'm a lawyer, but I'm not your lawyer. If you need some honest-to-goodness legal advice, go buy some.
Spats McGee is offline  
Old March 12, 2020, 05:16 PM   #21
Bart Noir
Senior Member
 
Join Date: August 5, 2000
Location: Puget Sound, USA
Posts: 2,207
Quote:
I slingshot reload anyway, so it doesn't bother me that much.
The issue is not about how to reload (release the slide or rack the slide) it is about knowing that you need to reload.

A defensive pistol which fails to tell you it is empty could be a big problem, in that very unlikely gunfight which we are trying to prepare for.

So I am glad the original problem is not still happening.

Bart Noir
__________________
Be of good cheer and mindful of your gun muzzle!
Bart Noir is offline  
Old March 21, 2020, 12:39 AM   #22
MrBot
Senior Member
 
Join Date: September 29, 2013
Posts: 109
I keep notes on every shoot I do. The hg failed to lock back the one day back in 9 19 using Remington brass 115 gr JHP so maybe it just doesn't like that round. The hg feeds literally everything flawlessly though so that's a blessing. But I got some great input from the op so I'll keep it all in mind should it happen again.
__________________
[If you tell the same lie enough times people will eventually believe it. Joseph Goebbels

You are not ready for meat--you are still on the bottle. Stacy Washington: aka, Stacy On the Right]
MrBot is offline  
Old March 21, 2020, 07:55 AM   #23
Carl the Floor Walker
Senior Member
 
Join Date: June 3, 2017
Posts: 705
I would bet 10-1 it is from riding the slide.
Carl the Floor Walker is online now  
Old March 21, 2020, 10:37 PM   #24
MrBot
Senior Member
 
Join Date: September 29, 2013
Posts: 109
Yep. I probably just had a bad day. I had been using a Ruger SP-101 snubby with a bobbed hammer for edc but then switched over to the Shield. I hardly know the Shield is on me whereas that wasn't the case with the Ruger. Heck, I have to remind myself I'm carrrying with the Shield which I figure is a good problem to have. All-in-all though even with that one bad outing, I feel confident with the Shield. The thing has literally become a part of me.
__________________
[If you tell the same lie enough times people will eventually believe it. Joseph Goebbels

You are not ready for meat--you are still on the bottle. Stacy Washington: aka, Stacy On the Right]
MrBot is offline  
Old March 23, 2020, 05:50 PM   #25
Ignition Override
Senior Member
 
Join Date: February 18, 2008
Location: About 20 nm from the Big Muddy
Posts: 2,524
I finally found the comment stating which ammo was tried.

It can help when this is described in peoples' first post abut this issue.
Ignition Override is offline  
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 08:16 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
This site and contents, including all posts, Copyright © 1998-2018 S.W.A.T. Magazine
Copyright Complaints: Please direct DMCA Takedown Notices to the registered agent: thefiringline.com
Contact Us
Page generated in 0.08771 seconds with 8 queries