Buying LE Trade-In / Used Glocks & What to Look For


One of the most reliable firearms you can decide to buy is a police/LE trade-in or used Glock, if you know what to look for. When looking at one of these used Glocks there are important things you need to look for and replace, if you purchase one.  In this article, I will breakdown some of the key things to look for and avoid, as well as the critical parts that must be replaced after your purchase. A gun store will not let you strip the gun completely down to its small internal parts so you have to understand what to look for, to insure you are getting what you want. This will cover only Gen2 and some Gen3 Glocks, there is a reason for that, and you will see why as we go along.

Gen3 G22 & Gen2 G19
Gen3 G22 & Gen2 G19


First let’s talk about the advantages of buying a police trade-in or used Glock. When you understand what to look for in a used Gen2 or Gen3 Glock, you know you are buying the most reliable and longest serving generations of the Glock design. You are avoiding the sometimes problematic issues with the newer Gen3 and Gen4 designs and you are hopefully spending a lot less on the firearm.  On average you can get the trade-in /used Gocks in the Low to Mid-300 dollar range. I recently helped a co-worker select an excellent condition LE trade-in G23. He spent $314.00 on the firearm, I put in $20.00 worth of parts and it was good to go.  Another huge advantage and one of the main reasons to buy the older Glocks, is no MIM parts. The Gen2 and select Gen3 Glocks have investment cast /machine tool steel locking blocks, extractors and firing pins. You are getting a more robustly built Glock, with higher quality parts in those key areas, vs. the newer Glocks.

Serial Numbers:

You must pay close attention to serial numbers when looking at used Glocks. This will serve several purposes, unique to a Gen2 or Gen3 Glock.  The serial number will help you identify the approximate date of manufacturer and what to look for, depending on it being a Gen2 or Gen3 gun. Look to see if the Serial numbers on the Slide, Frame and Barrel match. If the serial numbers on any three of these only contain numbers, then they have been replace or are aftermarket if they are not OEM Glock.

CGN - Gen2 Mid-1997 / FCM - Gen3 Late- 2002
CGN – Gen2 Mid-1997 / FCM – Gen3 Late- 2002

Gen2 Glocks:

Gen2 guns have had several mandatory part changes and upgrades, depending on the approximate date of manufacturer. This will also help you understand how old the firearm is. All Gen2 guns will have the tool steel parts we have already talked about, unless someone changed them out.  In the 2002 Glock armorers guide, replacement of the old slide lock spring to the upgraded slide lock spring is recommended. All Gen2 guns will need this part upgraded.  Some Gen2 guns that have a black trigger bar will need the Six-Part upgrade.  Serial Numbers starting from AA through SL (depending on model) may need this upgrade, if not already done. (see Six-Part Upgrade: below for more information) If you stay in the three letter serial number range starting at (AAA###) and up, you should be ok as far as the Six-Part upgrade is concerned.

Gen3 Glocks:

With the Gen3 guns, you want to look at the serial number closely to make sure it was made before Early to Mid-2009. As long as you are under serial number range (MSZ###) or do not have the dip extractor you are probably ok as far as MIM parts.  Sometime in Early to Mid-2009, Glock started using the MIM locking blocks, extractors and firing pins. There may be some mixed MIM/non-MIM parts in the (M) serial number range, so be aware of that. The only required upgrade/replacement part in pre-2002 Gen3’s, is the replacement of the old slide lock spring to the upgraded slide lock spring, as mention above.  2002-2009 Gen3 guns will not require any part upgrades. important to note: if the serial number on the frame starts in the (EAK### through EVR###) range, the rear slide rails are prone to breakage. Glock recommends those frames be sent in for replacement.

Gen2 Extractor / Old Gen3 Extractor / MIM Dip Extractor
Gen2 Extractor / Old Gen3 Extractor / Dip (MIM) Extractor
Non-MIM locking Block (right), MIM Locking Block (left)
Non-MIM locking Block (left), MIM Locking Block (right)


There are some key areas of wear that you can look for, on trade-in /used Glocks. This will help you identify if the firearm has been used excessively or minimally, depending on caliber. Your .40 cal and .357 sig Glock will show more wear in these areas than a 9mm or 45ACP will, due to them being harder on the firearm.  Add all of these indicators up to make a decision on how used you think the firearm is. It will really help if you ask the gun shop, if you can removed the slide (field Strip) the firearm, to inspect the gun. I do not buy any used firearms unless I am able to do this. Bellow are examples of normal wear on 9mm and .40 cal Glocks, nothing extremely heavy.

1. Barrel Wear Areas

Barrel chatter marks will be visible on the outside of the barrel. The top of the barrel chamber will also have wear marks where it makes contact with the top of the slide. The stronger / more pronounced the wear in these areas will indicate use.

Barrel Wear G22 / G19 & G22 barrels / Slide Barrel Wear
Barrel Wear G22 / G19 & G22 barrels / Slide Barrel Wear

2. Slide Wear Areas

The outside slide condition will indicate carry use. The inside of the slide will show wear in two particular areas. The inside top of the slide will indicate wear, where the top of the barrel makes contact with the slide as it reciprocates and on the slide rails on each side of the barrel chamber.  Heavy peening wear on the slide rails slightly in front of the barrel chamber area indicates heavy use.

Slide Rail peening G19 / Inside Slide Wear Gen2 G19 / Inside Slide Wear Gen3 G22
Slide Rail peening G19 / Inside Slide Wear Gen2 G19 / Inside Slide Wear Gen3 G22

3. Frame Wear

You want to look at the frame carefully to inspect it for cracks or any major damage. While the frame is polymer (plastic), wear on the outside of the frame is not an indicator of firing use, only carry use. A lot of the LE trade-in guns are carried more than shot.

Frames-Right & Left Sides
Frames-Right & Left Sides

In the picture bellow; a G19, (SN# FKF 826), date from 2003, has a cracked dust cover.  I purchased this pistol for 334.00 dollars out the door.  I did not notice the crack at the time of purchase, but when I got home and did a detailed strip and inspection, I noticed the crack.  I remembered there was another G19 at the store with an FKF serial number, so I returned the next day with the cracked frame Glock. Luckily for me, this store was a Glock LE distributor and traded the firearm, no questions asked.  Make sure you check the frame areas very carefully, as some stores will not let you bring the firearm back.

Dust Cover Frame Crack
Dust Cover Frame Crack on SN#  (FKF 826) G19

Replacement Part Recommendations:

After selecting the used Glock and purchasing it using the information above, I would recommend purchasing an OEM Glock Spring Kit and have it instaulled. This serves two purposes. (1) If you have a Gen2 or Gen3 with the old slide lock spring, it is in the kit. (2) The spring kit replaces all six of the springs in the firearm and will insure that all springs are fresh as true round count will be unknown. Replacing the main recoil spring is also a good idea when round count is unknown. Since the main recoil spring and slide lock spring are in the kit, this is the best purchase as it will only cost you around $20.00 dollars. Most Glock parts are very inexpensive, if you identify any weird after market parts you are not sure about, replace them.

Spring Kit / Old Slide Lock Spring / New Slide Lock Spring
Spring Kit / Old Slide Lock Spring / New Slide Lock Spring

Trigger Springs (NY1) & (NY2):

Some Police/LE trade-in Glocks might have New York (NY) NY1 or NY2 Trigger Springs in them. A NY1 spring will be OD green and a NY2 spring will be Orange.  Bellow: The black frame on the left, has a NY1 OD green spring in it and the OD frame on the right, has a stock 5.5 lbs spring. If you have one of the NY Trigger Springs, your trigger pull will be heavier than the stock 5.5 lbs spring. You will probably want to removed the NY’s and replace it with the 5.5 lbs spring. If the Glock has a NY1 spring and the trigger pull is relatively smooth and easy to pull, it probably has an OEM (-) Connector. This is a popular combination with LE Glocks.


Now, you wont be able to see if the Connector is a (-), standard or (+) Connector, without stripping the Trigger Mechanism down, and the store is not going to let you do this. If you see the Glock has a NY1 Trigger Spring and the trigger pull is excessively hard/heavy to pull, it probably has a standard or (+) Connector.  You will have to decide if you want to spend the approximately 20.00 dollars to replace or experiment with there combination.  Note: I prefer a NY1 with (-) Connector combination in my Glocks.

(left) Black Frame with OD NY1 trigger spring (right) Green Frame with 5.5lbs Spring
(-) Connector & OD NY1 Trigger Spring

.40 Caliber Gen2 Glocks:

If you are buying an early Gen2 .40 caliber Glock, usually pre 1995, you will need to be on the lookout for the 4340 ejector.  The 4340 ejector was replaced with the 1882 ejector. Some confuse the 4340 ejector as a broken ejector, due to its short appearance.  The 4340 ejector was replaced, as it puts unnecessary stress on the extractor and due to late ejection can cause case deformation and crimping. This can also cause stove pipe issues.  Over time the use of the 4340 ejector can cause the extractor to break. If you find a .40 cal Glock with a 4340 ejector, you may want to pass on it. If you buy a Glock with the 4340 ejector, replace it with a new Trigger Mechanism Housing with the 1882 ejector.

4340 ejector & 1882 ejector
4340 ejector & 1882 ejector

Six-Part Upgrade:

It is important to note this upgrade is extremely rare to come across, as it was identified over 20 years ago. Some  Gen1 ‘s and early Gen2’s may require the Glock Six-Part upgrade as mention above. If you identify the Glock is one that needs this upgrade, I would suggest passing on that particular Glock as replacing the firing pin and extractor with new MIM parts would defeat one of the main reasons of getting the older/used Glock. If you are looking at a trade-in /used gun, you can easily pull the slide back and look at the trigger bar. If it is solid black and not just dirty from use, it will need the upgrade. This consists of replacing the (trigger bar, firing pin, firing pin safety & spring, extractor and spring-load bearing).

(Top / Right-Side of Frame) Silver Trigger Bar, no upgrade needed
(Top / Right-Side of Frame) Silver Trigger Bar, no upgrade needed

Conclusion / Final Thoughts:

Most police/LE trade-in Glocks have been maintained by a department armorer and will probably have the upgraded parts already in them, from years ago. Used Glocks that where in private hands, will more than likely be the ones that need minor part replacement here and there. I have purchased several LE trade-in /used Glocks. Two of my main personal defensive firearms are a late Gen2 G19 and an early Gen3 G22. These have been my go to Glocks and I prefer the quality of the older Glocks compared to the new offerings. Glock does not care if you are the original owner. They have a lifetime guarantee and if you ever have a problem, simply call them and they will take care of it on their dime. I will put a few links to serial numbers, they change from time to time, so if one does not work you can go to the next. Information on Glock serial numbers can be found here: (Glock Talk Serial Number Project),  (Glock Talk Serial Number current Updates),  as long as they stay up. If you remember to look for the key things talked about here, you will be walking away with a excellent Glock, that will be very dependable and reliable for years to come.



  1. As an avid sport shooter/hunter/reloader for decades with a variety of longarms and sidearms, I just purchased a new G19 G4, after swearing (for years) I wasn’t interested in owning a Glock… just didn’t care for the “looks”. (I have other autoloaders and revolvers, and in fact was a hardcore wheelgun man for several decades). But, I decided, 1., I wanted to see what all the years of “fuss” was about in support of Glocks, and, 2., I did get to thinking I needed at least one or two sidearms that have a ton of replacement parts floating around out there, in case of a “bad time” or whatever here stateside. I did see the LE trade-in Glocks, but didn’t know enough about that market to chance it. Now you’ve gone and made me feel like I’ve bought a piece of crap in the new Gen 4,and maybe I should have just picked up a LE piece. (Give me a second, here… gonna’ go throw up, now….)
    No, seriously, the new piece seems solid, and functioned without a hiccup right out of the box. But had I read your good article, here, earlier, I might have considered the LE trade-in if I could have found a 19 that suited me, condition and price-wise.

    BTW, the Glock site says that new Glocks only have a one year warranty on them.

    • I understand what their one year warranty states on the site, but it is well known that Glock takes care of people who have one. If you simple call and state what the problem is they will take care of you, usually on their dime. I have never turned in a warranty card and have never had an issue with their CS.

    • Yes, they state that in the owners manual, but, Glock will support their guns for a lifetime. I have one that is now 28 years old. It still goes bang every time I pull the trigger. It’s a early gen 2 G19. It was a police trade as well, serial number DTxxxUS.

      Part of Glock reliability is that they have less than 40 parts including mag. Few parts to break, added to a very sturdy platform=reliable gun that you can trust your life too. I first became knowledgeable of Glock in the mid 80’s when I was in the service. NATO Armies have been using them since their (Glock) beginning.

  2. …let me add, however, that the general consensus seems to be that Glock generally takes care of customers’ legitimate needs, regardless. But, indeed, the official Glock site only claims a one year warranty, and you supposedly have to register the purchase with them within 30 days, either with online or with a mail-in card.

  3. I only shoot/carry used LE Glocks. THBS I carried both the Gen-2 and 3 G-19 for years and have been an armorer for years as well. Currently my EDC is a G-19 Gen-3 from 2003…hardly any wear, shoots like every other Glock I have ever owned…great…currently, there are several sources for such guns at very reasonable prices…e-mail me if you need a referral

    • Can you pls send me sources for a used LE Glock 19. Have only found one locally and its shows lots of wear. Thanks very much

  4. The purchase of your friends gun for $314… Was it at a pawn shop and if so, how much do pawn shops sell Glocks for? How much do they buy guns for when folks come in to liquidate?

    • GT Distributors on a used gun sale day. At a LGS you will probably get less than 350 for a used Glock, but they will try to sell it for as close to 475 as possible. This all depends on condition. No matter where you get the used Glock follow the guidance listed in the article and don’t pay more than 400, IMO, depending on condition, unless it is a particular one (Gen) no longer in production or in new condition. An on line search (google) should find you several places that sell Le/Trade-In and used Glocks. New retail on a Gen3’s is 499 and Gen4’s is 539 for 9mm’s and .40’s. I have never payed more than 350 for excellent condition used ones. Just walk away and wait if the price is not right.

      • Thank you, Duncan. Found a nice Gen 2 G19!
        It’s on layaway now at a local pawn shop. Mine is 30-45 days!
        $400 was best I Gould lower it to. Good serial number.
        Thanks for intel.

  5. Lt Donn, please send me your address for referrals of places to buy. Have two Glocks but wife has claimed the Gen 4 G19 as her own… I’d like to pick up a G19 Gen 2 or 3 for better price!
    Thanks in advance,

  6. I have a G21 with an AZK291 US. I am making an educated guess it is a Gen2 from the mid 90’s. It has all the machined parts, very little wear, and all the sn#’s match. Any idea what kind of value it might hold?

    • It’s up to you what you think its worth and the person buying it. It’s a used Glock at the end of the day. I would not be looking to buy it if it was priced over 400 but that’s me.

  7. Reblogged this on rifletalk and commented:
    Happy New Year everyone. Apologies for not writing for the last few months but a return to Law Enforcement for one more tour of duty has meant little time for anything else. Since I am now back carrying a Glock I really liked this excellent article from the folks at about buying a used LE Glock and thought you may enjoy it also.

  8. Very good information, thank you for taking the time to compose and share. I have carried a Glock for almost 20 years and keep another in the nightstand.

  9. I recently purchased a LNIB Glock 22 2 Gen. at my LGS. It has been upgraded but NO wear at all anywhere at all. Dawson Precision rear night sites and Hi-Viz ft sights. Extended mag and slide release. Love it!!!

  10. Just found a nice San Antonio Police Department gen 3 G22 at a local pawn shop here in San Antonio for $420 with 3 hi cap mags..not shot a lot just a little holster wear is all!! 🙂

    • Just found a nice San Antonio Police Department gen 3 G22 at a local pawn shop here in San Antonio for $420 with 3 hi cap mags..not shot a lot just a little holster wear is all!! 🙂 serial SAxxxxTX

  11. Hi Duncan, thanks for writing the article, great info. I used your insight to track down an early gen2 21. Its in great shape and looks like it has a low round count. I would like to change the barrel for a threaded one so I can use my suppressor but I cannot find info on weather a new made barrel will fit. Do you know?


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