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Slide seems loose and rattles G21 Gen 4

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gen 4
23K views 43 replies 32 participants last post by  logboss  
#1 ·
Bought a NIB Glock G21 Gen 4. I noticed the rear of the slide can be moved side to side much more than any other Glock I have owned. I have owned a few G21s, a couple G20's, G30SF, G23 and so on.

Here's the situation. Pistol unloaded, Magazine out and trigger pulled to release firing pin spring tension. Holding the pistol in one hand and holding rear of slide in other hand I can move the slide side to side considerably more than any other Glock I have owned or looked at. It even has a noticeable noise (i.e. click/clack) when moving the slide as described. Releasing the trigger or not has no bearing on the issue. So don't confuse it with the usual firing pin noise/rattle.

I went to a couple gun retailers and saw another G21 Gen 4 somewhat loose, but not as loose as mine. Did some reading online and read some postings where other people noticed the same.

The pistol functions fine and I have not experienced any accuracy problems. Called Glock and they said it is nothing to be concerned about. Thye also said it is more common on the larger frames like the G21 and G20.

I know Glocks fairly well and am aware they are built a bit loose, but this is considerably more loose than any others I have ever seen.

Just wondering if anyone has any credible information on this.
 
#5 ·
Then what's the problem? :dunno:
My concern is as follows: If it is this loose out of the box, what is it going to be like after numerous rounds? Then considering when I took it back to where I bought it to get the advice from their Glock Armorer, he was concerned how loose it was too.

With all due respect - as for those that like to point out that the search function still works - yes I am aware of that. In nearly a decade of being a Glock-Talk forum member I can recall several times I acquired more and sometimes more beneficial info by reading prior post AND making a new post. :whistling:

As for buying a Gen 3, I certainly may had if one was available at the time of purchase - plus there were other mitigating factors that played into why I bought the Gen 4.

I will admit I may be overly concerned, but my technical background (which I won't bore anyone with the details) I tend to look at things of this nature in a different light.

God Bless
 
#20 ·
My concern is as follows: If it is this loose out of the box, what is it going to be like after numerous rounds? Then considering when I took it back to where I bought it to get the advice from their Glock Armorer, he was concerned how loose it was too.

With all due respect - as for those that like to point out that the search function still works - yes I am aware of that. In nearly a decade of being a Glock-Talk forum member I can recall several times I acquired more and sometimes more beneficial info by reading prior post AND making a new post. :whistling:

As for buying a Gen 3, I certainly may had if one was available at the time of purchase - plus there were other mitigating factors that played into why I bought the Gen 4.

I will admit I may be overly concerned, but my technical background (which I won't bore anyone with the details) I tend to look at things of this nature in a different light.

God Bless
Continuing to revive old thread, this time with a political opinion. Why can't people answer an OPs question without patronizing or demeaning the questioner? It's a type of trolling IMO to so selflessly explain "the search function works" or "if it didn't blow yer hand off, then what are you worried about?" Lame. If you have the answer, tell him. If you don't, go away. When people ask a question (no matter how dumb it seems), I'm guessing they are actually looking for the answer to said question. Not a dick measuring contest.
 
#6 · (Edited)
I have a G26 (since about 2004 with around 3,000 rounds through it) that has never missed a beat; yet, the thing is as loose as can be. It has not, if I recall correctly, become any looser over time. Can't get much looser. It is also very accurate. I had a G30 that was also very loose. I also have Glocks that are very tight.
 
#7 ·
How does the thing shoot? If you can hit what you are shooting at then what more can you want? It is just a tool and tools wear out the more you use them. My Glocks have some play side to side but not much and they shoot just fine. If you are loosing sleep over it, send it back to Glock or take to a Glock certified/trained Gunsmith to look at for you. Sounds like you're looking for a problem where none really exist.
 
#8 ·
I just bought a new Gen3 G20SF. The slide has a decent amount of play in it but so far it shoots and functions great. My 12 year old G23 is the same way and has been 100% since day one so I'm not worried. My G17 is tighter and so is my dads G26. Keep us updated, but I wouldn't worry too much, I think the looser ones are the more reliable ones :supergrin:
 
#11 ·
There are slide rail tightening tools that many 1911 gunsmiths know how to use. It's a simple repair that might do your Glock some good. Seems like everywhere I look in cyberspace this complaint keeps coming up. Don't know what's going on? Here's some useful information:

http://forums.1911forum.com/showthread.php?t=51420

http://forums.1911forum.com/showthread.php?s=&threadid=47842&highlight=peen
http://forums.1911forum.com/showthread.php?s=&threadid=47842&highlight=peen

Seems a shame that you might need to do this.

http://www.brownells.com/gunsmith-t...plies/handgun-tools/slide-tools/1911-auto-slide-tightening-tools-prod26691.aspx
 
#12 ·
Here's someone who may be able to help you out without requiring you to spend lots and lots of money: Jim Milk @ http://www.innovativecustomguns.com/ Jim doesn't usually work on Glocks; but he certainly knows how to tighten a slide. ;)
 
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#13 ·
Had time to take it out yesterday for some extensive shooting. Once I got my rear sight adjusted (installed new TruGlo TFO's) I was doing a fair job at maintaining 3" groups at 25 yards.

Then this afternoon I stopped in the gun shop where I bought the pistol and noticed they had another Gen 4 G-21 in stock. I gave it a good looking over and noticed it had the same loose feel at the rear of the slide as mine does.

Considering the way mine seemed consistently accurate and that I saw another new one as loose as mine I am no longer concerned.

My initial concern was considering I have owned a fair amount of Glocks, I had never seen any this loose. But it is a moot point considering the above mentioned info.
 
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#14 ·
1911 thinking about tight fit does NOT carry over well into the Glock world. That seemingly "sloppy" slide fit is actually an instance of the difference between wide tolerances and incorrectly fitting parts.

There are three classic Glock "rattles"; that slide-on-frame looseness is the source of one of them.
 
#15 ·
1911 thinking about tight fit does NOT carry over well into the Glock world. That seemingly "sloppy" slide fit is actually an instance of the difference between wide tolerances and incorrectly fitting parts.

There are three classic Glock "rattles"; that slide-on-frame looseness is the source of one of them.
:) I hear ya! All I'm going to say is that there's NO SLIDE-TO-FRAME RATTLE on any of my Glocks; (and I feel sorry for those who, now, have to go through this latest, 'Glock bugaboo').

(During function testing: A loose striker rattle is normal, and occasional magazine rattles are, more or less, to be expected. The magazine rattle can, by the way, be readily eliminated by an owner who knows what he's doing.) ;)
 
#18 ·
I had exactly the same problem with my new Glock 21 Gen 4 (born date April 2013). Despite the "don't worry it shoots fine" comments, I am with Glockman454's initial thoughts on this. I have eight other Glock pistols and have never encountered this problem. I sent it back to Glock. They tried to convince me that the rattle was the firing pin although I specifcally referenced the slide rattle and the slide tolerances. With all the consistency I have seen from all my other Gen 3's and Gen 4's, just a little disappointing!
 
#22 ·
I remember 10 years ago when I first started looking at Glocks and some of the wise *ss comments I got from a few. I also wasn’t into talk forums at that time either.
I really didn’t like the “try the search feature” comments because I had already read them.
For the most part GT is one of the best with mostly good and helpful people here.
I have a Gen3 20sf that is pretty loose but runs great.
 
#24 ·
I personally wouldn't be concerned.

The most important factor in semi handgun accuracy is the barrel to slide lockup. If a nice tightly locked up slide assembly is a little loose on the receiver, it likely will just be one of those guns that tolerates ammo more reliably, all the while being an excellent shooter.
 
#26 ·
Continuing to revive old thread, this time with a political opinion.
Re-opening an old thread for the sole purpose of making pompous sanctimonious self-righteous off-topic commentary that has ABSOLUTELY NOTHING to do with the thread, Glocks, or the focus of the General Glocking forum is more than just a little bit bizarre.

God save us from self-appointed social justice warriors!
 
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#27 · (Edited)
Mike-M. I was looking for information that this thread could have answered and eventually did answer. So my question was answered, but I had to dig through unhelpful responses. This happens every time I am looking for information that to me is important and somewhat time sensitive. So it's irritating to not get an answer.

You're doing the same thing I did. You're just criticizing my noncontributing to the initial thread.