How to Buy a Police Trade-In Pistol (and What to Check First)

Why trade-ins exist at all

Law enforcement agencies don't sell their pistols one at a time. They swap them in batches, usually when they adopt a new model, a new generation, or a new caliber. The old guns typically go back to a distributor or manufacturer as credit toward the new ones, and then trickle out to dealers as "police trade-ins" or "LE trade-ins."

Caliber changes in particular have pushed a lot of guns into the used market. The FBI announced in 2015 that it was going back to 9mm, and many federal and local agencies have since transitioned from .40 S&W to 9mm. U.S. Customs and Border Protection, for example, replaced .40 S&W HK P2000 pistols with 9mm Glocks in 2019. Every one of those switches retires a rack of perfectly serviceable .40 pistols.

This is a buying guide built from published references and general used-gun inspection practice, not hands-on testing of any particular batch. Condition varies gun to gun, which is the whole point of the checklist below.

What usually shows up

You'll see the same few families over and over, because they are what agencies buy:

• Glock: Reference sources describe Glock pistols as supplied to police forces in at least 48 countries, including the majority of U.S. police agencies. Expect G17, G19, G22 and G23 trade-ins, often Gen 3 or Gen 4. Gen 4 was introduced at the 2010 SHOT Show and Gen 5 in 2017, and both are marked on the slide.
• SIG Sauer P226 and P229: long-time duty pistols in 9mm, .40 S&W and .357 SIG, with a double-action/single-action trigger and decocker on most versions.
• Smith & Wesson M&P: the polymer "Military & Police" pistol S&W introduced for law enforcement in 2005.
• Others: Beretta 92-pattern pistols, HK P2000 and USP variants, and the occasional revolver from an older inventory.

Holster wear vs real wear

This is the most important skill in buying a trade-in. Duty guns get carried for years in retention holsters, in and out of cars, through rain and heat. They look tired. That doesn't mean they are worn out.

A lot of duty pistols are shot at qualifications a few times a year and otherwise ride in a holster. That's why a trade-in can look rough outside and still have plenty of life inside. But not every agency gun had an easy life, and training guns, range guns or armorer's spares can have far more rounds through them. You only find out by looking.

The counter check, step by step

Ask the dealer before you start, and follow the shop's rules. Treat the pistol as loaded until you've verified otherwise yourself.

1. Clear it. Remove the magazine, lock the slide back, and look and feel to confirm the chamber and magazine well are empty. Keep it pointed in a safe direction the whole time.
2. Read the slide and frame. Note the model, generation, caliber and serial number, and check that the slide and frame look like they belong together. Mismatched parts aren't automatically bad, but you should know.
3. Look down the bore. Use a small flashlight or bore light from the breech end. You want bright, clean rifling. Frosting is cosmetic; pitting, bulges or rings are not.
4. Check slide-to-frame fit. With the slide forward, a little play is normal on many service pistols. What you don't want is rattling, binding, or visible cracks on the rails.
5. Inspect the breech face and feed ramp. Look for heavy erosion, gouges or peening.
6. Test the trigger and reset. With the shop's permission and a cleared gun, dry-fire once, then hold the trigger back, rack the slide, and ease the trigger forward until it resets. The reset should be clear and consistent. A gritty, inconsistent or non-resetting trigger needs a gunsmith.
7. Check the springs. The slide should return to battery firmly. A weak or tired-feeling recoil spring is an easy replacement but a sign of use.
8. Check the sights. Make sure they're tight in their dovetails, then look at the night-sight inserts in a dark corner (more below).
9. Count the magazines. Many trade-ins come with one magazine, some with none. Check that the feed lips aren't cracked and the follower moves freely.
10. Ask about returns. If you can't inspect in person, buy from a seller with a clear return or inspection policy.

For the full long-form version of a used gun inspection, see our used gun checklist and the broader new vs used guide.

Night sights have an expiry date

Many duty pistols wear tritium night sights. Tritium glows without batteries, but it decays: its half-life is about 12.33 years, so the light output halves on that schedule, and the phosphor that turns the radiation into visible light also degrades over time. Reference sources describe the useful life of tritium tubes as roughly 10 to 20 years.

Translation: a decade-old duty gun may have sights that are dim or barely visible in the dark. Step into a shaded corner of the shop, cup your hands, and look. If they're faint, factor the cost of replacement sights into what you're willing to pay. The pistol itself is fine; the sights are a consumable.

Magazines and the hidden costs

A trade-in that looks cheap can get less cheap once you add what it's missing:

• Magazines. Plan on buying at least two or three. Common duty models are well supported: see Glock 19 magazines, S&W M&P magazines and SIG P320 magazines. Check compatibility with your exact model and generation before ordering.
• Night sights if the tritium is dim.
• Springs, especially the recoil spring, if the gun has had a lot of use.
• A holster that fits the exact model, generation and any light.
• Transfer fees if you buy online and ship to a local dealer.

Add it up before you decide a trade-in is the better deal than a new gun. Sometimes it is by a wide margin; sometimes it's close.

Where to buy and how

Trade-ins show up at local shops, distributors and online retailers. Online sellers sometimes grade them (for example "good" or "very good") and may or may not let you choose a specific gun. Read the grading notes and the return policy carefully. If you buy online, the pistol ships to a licensed dealer near you; our FFL transfer guide covers that process.

Before your first range trip, run a function check with a few boxes of 9mm or .40 range ammo, using several magazines, and confirm the gun feeds, fires, ejects and locks back reliably. Clean it fully first, since you don't know when it was last serviced. Ammunition Depot also lists current new handguns if you want to compare the trade-in against a new equivalent.

The bottom line

Editorial note: This is an independent editorial overview built from manufacturer specifications, retailer listings and published sources. We have not performed hands-on testing of the products discussed, and nothing here is a performance guarantee. Verify specifications, compatibility and the law where you live.

Affiliate disclosure: Some links on this page are affiliate links to Ammunition Depot. We may earn a commission if you buy through them, at no extra cost to you. Our editorial choices are not influenced by commissions. Check current price, stock and specifications directly with the retailer.