TEC-9 Magazines and Parts: History and Compatibility

Since Intratec closed around 2001, owners of TEC-9, TEC-DC9 and AB-10 pistols have relied on original factory parts, aftermarket copies and a shrinking pool of used magazines. This guide covers what the factory made, what is generally reported to interchange, and what to look out for. It is based on published histories and owner reports, not on factory documents, which are hard to find. Treat compatibility notes as a starting point and test any part in your own pistol. We are not affiliated with Intratec, and we do not sell TEC-9 pistols or TEC-9-specific parts; our catalog covers currently made firearms, magazines and ammunition.

A quick model timeline

KG-9 (early 1980s): the Interdynamic of America open-bolt pistol that started the line.
KG-99: the closed-bolt redesign.
TEC-9 (mid-1980s): Intratec's version, with a steel upper, polymer lower and barrel shroud.
TEC-DC9: a revised model with detail changes.
TEC-9 Mini: a short-barrel, unshrouded version.
AB-10 (1994 onward): the "After Ban" model without a threaded barrel or shroud, sold with 10-round magazines.
TEC-22: a separate .22 LR pistol with similar styling.

More detail is in our TEC-9 history.

Magazines

The 9mm Intratec pistols used a double-stack, single-feed box magazine that inserts in front of the trigger guard. Factory and period magazines were made in several capacities, most commonly 10, 20, 32 and 36 rounds. Owners generally report that:

Magazines for the TEC-9, TEC-DC9, TEC-9 Mini and AB-10 interchange among those models.
Many KG-99 magazines are reported to fit the later Intratec pistols, although fit varies with production dates.
TEC-22 magazines do not fit the 9mm models, and vice versa.
Magazines from other 9mm pistols do not fit without modification, and modified magazines are a common cause of malfunctions.

Reliability depends heavily on magazine condition. Common problems include weak springs, cracked or spread feed lips and dented bodies. Aftermarket magazines of varying quality were made during and after production; many owners find original factory magazines run better.

Magazine laws

Before buying any TEC-9 magazine, check your state's limits. Several states restrict magazines above 10 rounds, including California, Maryland, New Jersey, New York and Massachusetts, while Colorado caps sales and transfers at 15 rounds and Vermont and Delaware have their own limits. Some states ban possession, not just sale, and some grandfather magazines owned before a cutoff date. See TEC-9 legal status for more.

Parts that wear

The TEC-9 uses a simple blowback action with stamped and cast parts. The parts owners most often report replacing are:

Recoil spring: a worn spring increases battering of the bolt and frame. Replace on a schedule if you shoot the pistol regularly.
Firing pin and firing pin spring: light strikes are a common complaint on older guns.
Extractor: a worn extractor causes failures to extract.
Magazine catch: wear leads to magazines dropping or seating poorly.
Sights: the factory sights are basic, and some owners replace or mount optics on the upper.
Polymer lower frame: check for cracks around the pin holes and the magazine well. A cracked lower is a serious problem, because on these pistols the frame is the serialized part and replacements are limited.

Sources for parts

With no factory, parts come from used parts kits, surplus inventory held by parts dealers and some reproduction parts from small makers. Quality varies. When buying:

Match the part to your exact model, since TEC-9, TEC-DC9 and AB-10 details differ.
Prefer original parts from reputable sellers over unknown reproductions.
Have a gunsmith inspect and install parts if you are not comfortable doing it yourself.
Do not buy any part or kit that changes how the pistol fires, adds a stock without the required federal registration, or is marketed as a legal workaround. Keep the pistol in its factory configuration.

Barrel, shroud and threaded-barrel parts

The barrel shroud and threaded barrel of early TEC-9s are the features many state laws focus on. Adding a shroud or a threaded barrel to an AB-10, or installing threaded-barrel parts on any pistol, can change its legal status in states with feature-based bans. In other states these parts are legal, but check first. Barrel extensions or suppressor mounts bring federal rules into play; suppressors require ATF approval and registration.

Ammunition

The 9mm Intratec pistols were designed around standard-pressure 9x19mm ammunition. Owners generally report the best results with 115 and 124 grain full metal jacket loads. Hollow points with wide mouths may not feed reliably in older guns, and +P loads add stress to an aging blowback action. Avoid steel-cased ammunition if your pistol shows extraction problems. Our store carries 9mm ammunition that ships to your door where state and local law allow.

Cleaning and storage

Blowback pistols get dirty quickly; clean the bolt face, chamber and breech area after each session.
Keep the bolt and rails lightly lubricated.
Store magazines partly loaded or unloaded if springs are old.
Store the pistol locked and away from children, and follow any state storage laws.

Buying used parts and magazines safely

Used magazines and parts often change hands through online auctions, gun shows and forums. Ask for clear photos of feed lips and springs, confirm the model the part came from, and expect to replace springs on anything decades old. Keep receipts, since some states require proof that a magazine was owned before a cutoff date. If a seller cannot say what model a part came from, assume it may not fit.

When a used TEC-9 is not worth it

If a used pistol needs a new lower, several springs and magazines, the total can exceed the price of a new, currently made 9mm with a warranty. For shooting rather than collecting, see pistols like the TEC-9. For how to order a current firearm to your local dealer, read buying a pistol online.

Not affiliated with Intratec. Model names are used only to identify historical firearms and compatible parts.

General information, not legal advice. Current as of September 2026. Laws change; check the official source before you act.