New Glock 17 Mags in a Glock 19: Not So Good

TunnelRat · July 26, 2015, 02:32 PM

Hi all,
CDNN has a sale running this week on Glock mags so I figured I'd take advantage. I picked up 2 G17 mags and 1 G19 mag, all of them new production compatible with Gen 4. I just got done using them in my Gen 3 G19 at the range and I was pretty surprised. Loaded to capacity I could insert the magazine, release the slide, and nothing. I was sling shotting the slide so I'm not sure if it would have worked had I used the slide stop. The slide would run into the top round and stop dead cold. The top round barely moved. It took downloading to at most 15 rds to get the top round to feed reliably. Even pulling the slide back and trying again didn't work. I did get get the top round to feed when 16 were loaded once or twice, but not reliably.

My hope was to use these as backups for home defense to have a few extra rounds. Right now that's not in the cards. I had no issue with the 15 rd G19 mag loaded to capacity nor have I had an issue with any of my G19 mags in my G19. Is this just a really stiff magazine spring causing the problem? It was stiff getting the last couple rounds in but far from impossible. I'd appreciate any tips.

-TR

Nathan · July 26, 2015, 02:50 PM

Possibly your recoil spring is expired...

Palmetto-Pride · July 26, 2015, 02:56 PM

Leave them fully loaded inserted against the slide for a week and see if you still have the problem.

TunnelRat · July 26, 2015, 02:58 PM

The recoil spring has a total of 560 rds on it. This Glock is a month old, bought as new production.

Thanks Palmetto, will do!

snolden · July 26, 2015, 11:39 PM

I had same issue with a new production Glock 18 33 rd happy stick. So I run 32 rounds now.

jglsprings · July 26, 2015, 11:50 PM

Did you tear down and clean these new mags?

JDBerg · July 27, 2015, 10:44 AM

Assuming these are new Glock factory Gen4 mags, try down loading the mags to 5 rounds and make sure you can cycle all five rounds & slide lock each of these mags, load a additional round in each reload cycle until you work your way up to the 17 capacity.

If these are not new Glock factory Gen4 mags, I'd return them to CDNN

jmr40 · July 27, 2015, 11:29 AM

Mag springs are still new and stiff. Load em fully and leave them for a few days. I'm betting the settle down.

TunnelRat · July 27, 2015, 12:09 PM

Quote:

Originally Posted by JDBerg

Assuming these are new Glock factory Gen4 mags, try down loading the mags to 5 rounds and make sure you can cycle all five rounds & slide lock each of these mags, load a additional round in each reload cycle until you work your way up to the 17 capacity.

If these are not new Glock factory Gen4 mags, I'd return them to CDNN

As I said in the original post I did the same but in reverse. 15 rds and below and it will work generally well. 10 rds and below it works 100%. To be fair I didn't fill out a complete test matrix from 1-17 rds. These are new factory mags from CDNN.

marine6680 · July 27, 2015, 12:35 PM

Most likely spring pressure issues... Could be incorrectly assembled mags... Maybe.

As was mentioned, letting the mags sit fully loaded for several days may help.

cougar gt-e · July 27, 2015, 05:12 PM

Tight springs maybe tight gun too. Run the -CENSORED--CENSORED--CENSORED--CENSORED- out of it and it will soon be 100%.

AK103K · July 27, 2015, 05:32 PM

I use 17 mags for the reloads on all my Glocks, 17's, 19's, and 26's. Havent had any issues with any of them. That goes for the Korean mags as well.

The only mag related issues I have run across, is using the 33 rounders in my 26's. With the 26's, your hand actually contacts the mag (its not an issue with the others), and can cause malfunctions.

Not that Id be happy about it happening, and not really something Id expect from Glock, but Id probably disassemble the mags (make sure the springs look right) and reassemble them, and then do as others have suggested, and load them up and let them sit a day or to and see what happens.

Skeets · July 28, 2015, 10:33 AM

IMHO new mags are bought to avoid problems,not to require rebuilding themselves!Back they go! Good Luck.....

Sharkbite · July 28, 2015, 11:22 AM

Option 1. Return for replacement (see the above post)
Option 2. Tear em down and inspect CAREFULLY. Im thinking a plastic flash left over from molding is causing the follower to hang up towards the bottom of the tube. When downloaded the folower does not hit the flash.

Regular Joe · July 28, 2015, 11:23 AM

I too run the 17's in all of my Glocks without issue. The 33's don't work in the 17L or in the 26. I take this to be an issue with the angle of the feed ramp as it meets the magazine on those 2, though it really doesn't make sense.
My Gen. 3 19 works with everything that will fit in it.

Walt Sherrill · July 28, 2015, 11:47 AM

Glock mag springs (new mags) are notorious for being very stout... And if they're stout enough, they could keep the slide from cycling.

If they'll chamber with one round or two rounds downloaded, that would suggest strong springs (and not something more "physically" mechanical. In that case, just leave the mags FULLY loaded for a week or two.

Tactical Jackalope · July 28, 2015, 02:32 PM

That's weird. I've never had an issue with Glock 17 mags in my 19's. Not even the Glock 18 mags have ever had an issue.

TunnelRat · July 28, 2015, 04:07 PM

Quote:

That's weird. I've never had an issue with Glock 17 mags in my 19's. Not even the Glock 18 mags have ever had an issue

Neither had I. Nor have I had issues with fullsize M&P mags, fullsize P320 mags, fullsize XDm mags, the list goes on and on. When I released the slide and it stopped on the round I was pretty shocked. I've even used Wolff extra power mag springs in G19 mags that I use a lot and despite being notably stiff this never happened. These are just factory springs in these G17 mags.

As stated I have them loaded all the way and sitting in the safe for a week and then I'll see where I stand.

Walt Sherrill · July 28, 2015, 04:43 PM

Will they feed with them downloaded a round or two? If so, then I think it's SURE that the strong springs are an issue. Otherwise, it may be something else.

Any noticeable difference between these problem mags and ones that work right?

TunnelRat · July 28, 2015, 07:58 PM

Quote:

Will they feed with them downloaded a round or two? If so, then I think it's SURE that the strong springs are an issue. Otherwise, it may be something else.

Has to be at least 2 rds down to feed, 3 rds down to feed 100%. Lower than that and there are no issues. I agree that springs are the only issue I can think of.

Quote:

Any noticeable difference between these problem mags and ones that work right?

Not that I can see. Molding on the body seems good, feed lips look straight, and the followers don't seem to be tilting.

TunnelRat · August 1, 2015, 09:46 PM

So it turns out the problem wasn't the magazines. Inspected the magazines today, put one in the pistol, pull back on the slide and thunk. Still won't strip the round. Got the idea here to try the slide stop and sure as could be it works like a charm. Now I'm confused. I neglected to mention that this G19 has a Vicker's Tactical slide stop. I put the factory slide stop back in and success, the slide strips the top round no problem. Now I'm surprised. I have another G19 set up the exact same way (one for beating on in classes, one for carry and home defense) and I try the magazines in that G19. Works like a charm despite also having a Vicker's Tactical slide stop.

I got lazy at this point and just wanted to go to the range. The question is if this particular G19 doesn't like Vicker's Tactical slide stops, or if this Vicker's Tactical slide stop is just slightly out of spec. Comparing the two slide stops I don't see a difference, same with the pistols. Anyway, I wanted to exonerate the magazines.

Walt Sherrill · August 2, 2015, 09:16 AM

That is a puzzle! I don't understand how a slide stop could keep a gun from stripping around from the mag -- but don't doubt that you've correctly reported what you found.

With the Vickers slide stop installed, can you use the slingshot or do the hand-over release techniques to get it to strip the top round? (It may be something as simple as polishing/sanding the part of the slide stop that presses against the notch on the slide; maybe it's just grabbing too much when released and slowing the process.

Really unusual.

TunnelRat · August 2, 2015, 10:50 AM

Quote:

With the Vickers slide stop installed, can you use the slingshot or do the hand-over release techniques to get it to strip the top round?

Not on the G17 mags if they're fully loaded, but it works fine on the G19 mags even if they're fully loaded. And again, the other G19 with a Vicker's slide stop doesn't have this problem. As best as I can tell visually the offending slide stop is still catching the slide when the slide is pulled rearward with the G17 mags. It's not dropping out of the way and the slide is just slamming into that slide stop. It's not actually hitting the round at all, that was my mistake earlier.

I think you're right about polishing/sanding. For some reason the Vicker's slide stop in that particular pistol seems to sit a bit far rearward.

July 26, 2015, 02:32 PM	#1
TunnelRat Senior Member Join Date: May 22, 2011 Posts: 12,212	New Glock 17 Mags in a Glock 19: Not So Good Hi all, CDNN has a sale running this week on Glock mags so I figured I'd take advantage. I picked up 2 G17 mags and 1 G19 mag, all of them new production compatible with Gen 4. I just got done using them in my Gen 3 G19 at the range and I was pretty surprised. Loaded to capacity I could insert the magazine, release the slide, and nothing. I was sling shotting the slide so I'm not sure if it would have worked had I used the slide stop. The slide would run into the top round and stop dead cold. The top round barely moved. It took downloading to at most 15 rds to get the top round to feed reliably. Even pulling the slide back and trying again didn't work. I did get get the top round to feed when 16 were loaded once or twice, but not reliably. My hope was to use these as backups for home defense to have a few extra rounds. Right now that's not in the cards. I had no issue with the 15 rd G19 mag loaded to capacity nor have I had an issue with any of my G19 mags in my G19. Is this just a really stiff magazine spring causing the problem? It was stiff getting the last couple rounds in but far from impossible. I'd appreciate any tips. -TR __________________ Know the status of your weapon Keep your muzzle oriented so that no one will be hurt if the firearm discharges Keep your finger off the trigger until you have an adequate sight picture Maintain situational awareness

July 26, 2015, 02:56 PM	#3
Palmetto-Pride Senior Member Join Date: May 31, 2009 Location: Charleston, SC Posts: 2,071	Leave them fully loaded inserted against the slide for a week and see if you still have the problem. __________________ “The problem with socialism is that you eventually run out of other people's money.” -Margaret Thatcher-

July 26, 2015, 02:58 PM	#4
TunnelRat Senior Member Join Date: May 22, 2011 Posts: 12,212	The recoil spring has a total of 560 rds on it. This Glock is a month old, bought as new production. Thanks Palmetto, will do! __________________ Know the status of your weapon Keep your muzzle oriented so that no one will be hurt if the firearm discharges Keep your finger off the trigger until you have an adequate sight picture Maintain situational awareness

July 26, 2015, 11:50 PM	#6
jglsprings Senior Member Join Date: January 7, 2009 Posts: 1,827	Did you tear down and clean these new mags? __________________ Let's eat Grandma. Let's eat, Grandma. Commas save lives...

July 27, 2015, 10:44 AM	#7
JDBerg Senior Member Join Date: May 18, 2015 Location: PA Posts: 1,835	Assuming these are new Glock factory Gen4 mags, try down loading the mags to 5 rounds and make sure you can cycle all five rounds & slide lock each of these mags, load a additional round in each reload cycle until you work your way up to the 17 capacity. If these are not new Glock factory Gen4 mags, I'd return them to CDNN __________________ 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 Last edited by JDBerg; July 27, 2015 at 10:50 AM.

July 26, 2015, 02:50 PM	#2
Nathan Senior Member Join Date: July 1, 2001 Posts: 6,331	Possibly your recoil spring is expired...

July 26, 2015, 11:39 PM	#5
snolden Senior Member Join Date: January 25, 2006 Location: N. E. AZ Posts: 387	I had same issue with a new production Glock 18 33 rd happy stick. So I run 32 rounds now.

July 27, 2015, 11:29 AM	#8
jmr40 Senior Member Join Date: June 15, 2008 Location: Georgia Posts: 10,809	Mag springs are still new and stiff. Load em fully and leave them for a few days. I'm betting the settle down.

July 27, 2015, 12:35 PM	#10
marine6680 Senior Member Join Date: July 24, 2012 Location: Parker, CO Posts: 4,594	Most likely spring pressure issues... Could be incorrectly assembled mags... Maybe. As was mentioned, letting the mags sit fully loaded for several days may help.

July 27, 2015, 05:12 PM	#11
cougar gt-e Senior Member Join Date: July 25, 2009 Posts: 1,003	Tight springs maybe tight gun too. Run the -CENSORED--CENSORED--CENSORED--CENSORED- out of it and it will soon be 100%.

July 27, 2015, 05:32 PM	#12
AK103K Senior Member Join Date: May 1, 2001 Posts: 10,223	I use 17 mags for the reloads on all my Glocks, 17's, 19's, and 26's. Havent had any issues with any of them. That goes for the Korean mags as well. The only mag related issues I have run across, is using the 33 rounders in my 26's. With the 26's, your hand actually contacts the mag (its not an issue with the others), and can cause malfunctions. Not that Id be happy about it happening, and not really something Id expect from Glock, but Id probably disassemble the mags (make sure the springs look right) and reassemble them, and then do as others have suggested, and load them up and let them sit a day or to and see what happens.

July 28, 2015, 10:33 AM	#13
Skeets Member in memoriam Join Date: April 6, 2015 Location: Indiana Posts: 583	IMHO new mags are bought to avoid problems,not to require rebuilding themselves!Back they go! Good Luck..... __________________ Skeets "Over Kill Never Fails"

July 28, 2015, 11:22 AM	#14
Sharkbite Senior Member Join Date: November 4, 2013 Location: Western slope of Colorado Posts: 3,679	Option 1. Return for replacement (see the above post) Option 2. Tear em down and inspect CAREFULLY. Im thinking a plastic flash left over from molding is causing the follower to hang up towards the bottom of the tube. When downloaded the folower does not hit the flash.

July 28, 2015, 11:23 AM	#15
Regular Joe Senior Member Join Date: November 6, 2008 Posts: 255	I too run the 17's in all of my Glocks without issue. The 33's don't work in the 17L or in the 26. I take this to be an issue with the angle of the feed ramp as it meets the magazine on those 2, though it really doesn't make sense. My Gen. 3 19 works with everything that will fit in it.

July 28, 2015, 11:47 AM	#16
Walt Sherrill Senior Member Join Date: February 15, 1999 Location: Winston-Salem, NC USA Posts: 6,348	Glock mag springs (new mags) are notorious for being very stout... And if they're stout enough, they could keep the slide from cycling. If they'll chamber with one round or two rounds downloaded, that would suggest strong springs (and not something more "physically" mechanical. In that case, just leave the mags FULLY loaded for a week or two.

July 28, 2015, 02:32 PM	#17
Tactical Jackalope Senior Member Join Date: December 5, 2010 Location: Miami, Florida Posts: 6,429	That's weird. I've never had an issue with Glock 17 mags in my 19's. Not even the Glock 18 mags have ever had an issue.

July 28, 2015, 04:43 PM	#19
Walt Sherrill Senior Member Join Date: February 15, 1999 Location: Winston-Salem, NC USA Posts: 6,348	Will they feed with them downloaded a round or two? If so, then I think it's SURE that the strong springs are an issue. Otherwise, it may be something else. Any noticeable difference between these problem mags and ones that work right?

August 1, 2015, 09:46 PM	#21
TunnelRat Senior Member Join Date: May 22, 2011 Posts: 12,212	So it turns out the problem wasn't the magazines. Inspected the magazines today, put one in the pistol, pull back on the slide and thunk. Still won't strip the round. Got the idea here to try the slide stop and sure as could be it works like a charm. Now I'm confused. I neglected to mention that this G19 has a Vicker's Tactical slide stop. I put the factory slide stop back in and success, the slide strips the top round no problem. Now I'm surprised. I have another G19 set up the exact same way (one for beating on in classes, one for carry and home defense) and I try the magazines in that G19. Works like a charm despite also having a Vicker's Tactical slide stop. I got lazy at this point and just wanted to go to the range. The question is if this particular G19 doesn't like Vicker's Tactical slide stops, or if this Vicker's Tactical slide stop is just slightly out of spec. Comparing the two slide stops I don't see a difference, same with the pistols. Anyway, I wanted to exonerate the magazines. __________________ Know the status of your weapon Keep your muzzle oriented so that no one will be hurt if the firearm discharges Keep your finger off the trigger until you have an adequate sight picture Maintain situational awareness

August 2, 2015, 09:16 AM	#22
Walt Sherrill Senior Member Join Date: February 15, 1999 Location: Winston-Salem, NC USA Posts: 6,348	That is a puzzle! I don't understand how a slide stop could keep a gun from stripping around from the mag -- but don't doubt that you've correctly reported what you found. With the Vickers slide stop installed, can you use the slingshot or do the hand-over release techniques to get it to strip the top round? (It may be something as simple as polishing/sanding the part of the slide stop that presses against the notch on the slide; maybe it's just grabbing too much when released and slowing the process. Really unusual.