BROWNING B725 MAINSPRING .12/20 CAL

The Browning Mainspring is the original Type 2 or Gen 2 mainspring for the firing mechanism of the Browning B725 over-and-under shotgun. This steel spare part is listed as position 46 on the manufacturer's parts diagram and is intended for replacing worn or damaged springs in suitable 12 and 20 gauge configurations.

Suitable for use

• For servicing the Browning B725 Type 2 firing mechanism

• For repairing the Browning Citori 725 Gen 2 model

• For replacing a worn, weakened, or damaged mainspring

• For 12 gauge B725 configurations after compatibility check

• For 20 gauge B725 configurations after compatibility check

• For restoring the firearm to factory specifications

• For repairing a hunting or sporting shotgun

• As a spare part for gunsmiths

• For eliminating possible misfire causes after professional diagnostics

• For users who prefer Browning original spare parts

Why choose the Browning B725 Type 2 mainspring?

• Browning original spare part

• Type 2 or Gen 2 construction

• Manufacturer's parts diagram position 46

• Designed for B725/Citori 725 firing mechanism

• Listed in European spare parts catalogues for 12 and 20 gauge

• Made of steel

• Maintains the mechanism's factory construction

• Suitable for direct replacement of a worn original spring with proper configuration

• Allows ordering the spare part by exact code, not just by appearance

Technical specifications

• Manufacturer: Browning

• Product type: firearm spare part

• Part name: mainspring

• English name: mainspring

• Construction version: Type 2 / Gen 2

• Spare parts diagram position: 46

• Main model: Browning B725

• US model name: Browning Citori 725

• Gauge compatibility: 12 and 20 gauge according to specific firearm configuration

• Possible additional compatibility: in some European catalogues also listed for B825 model

• Material: steel

• Function: provides the hammer with the energy needed to strike the cartridge primer

• Installation location: firearm firing and trigger mechanism

• Original spare part: yes

• Quantity in package: 1 pc

• Installation: preferably by a qualified gunsmith or authorized service

Compatibility must be confirmed before ordering based on the exact firearm model, gauge, mechanism generation, and serial number. Similar shape or model name does not guarantee part compatibility.

Included in the package

• 1 × Browning B725 Type 2 / Gen 2 mainspring B133800054

Mainspring guide, hammer, firing pin, mounting elements, and other mechanism parts are not included.

Frequently Asked Questions

What does the Browning B725 mainspring marking Type 2 or Gen 2 mean?

Type 2 and Gen 2 indicate the second-generation construction of the part. It is not automatically interchangeable with the earlier Type 1 spring, so the version of the firearm's mechanism must be determined before ordering.

Does B133800054 fit a 12 gauge Browning B725 shotgun?

Yes, the part is listed for 12 gauge B725/Citori 725 Type 2 models. Exact compatibility should still be confirmed according to the firearm's serial number and parts diagram.

Does this mainspring also fit the 20 gauge B725 model?

In European Browning spare parts lists, B133800054 is listed for 12 and 20 gauge Type 2 B725 models. Before purchase, have the seller or a gunsmith check the compatibility with your specific firearm.

Does the mainspring fit the Browning B825 model?

In some European parts catalogues, B133800054 is also listed for the B825 model. However, B825 compatibility should not be assumed based only on the model name – always check the firearm's gauge, serial number, and mechanism version.

When should the Browning B725 mainspring be replaced?

Replacement may be necessary if the spring is damaged or if the firing pin leaves uneven or too weak marks on the cartridge primer. Misfires can also be caused by the firing pin, dirt, ammunition, or other mechanism parts, so professional diagnostics are required.

How many mainsprings are in the package?

The package contains one mainspring. The gunsmith must decide whether to replace one spring or check and replace both during maintenance.

Is the firing pin included?

No. B133800054 refers only to the Type 2 mainspring. Firing pins, firing pin springs, guides, and other spare parts must be ordered separately if needed.

Can the mainspring be installed by the user?

The mainspring is located in a tensioned firing and trigger mechanism. For safety, proper function, and firearm reliability, we recommend installation by a qualified gunsmith.

When is the Browning B725 Type 2 mainspring the right choice?

B133800054 is the right choice if a qualified gunsmith or exact parts diagram confirms that your firearm has the Browning B725/Citori 725 Type 2 or Gen 2 mechanism. It is suitable for replacing the original mainspring if the existing spring is worn, damaged, or has lost necessary elasticity.

For Type 1 mechanisms, other Browning models, or unconfirmed B825 configurations, you must choose the alternative part corresponding to your firearm's serial number. If misfires are the problem, the mainspring should not be replaced based solely on assumption, as the cause may also be the firing pin, its spring, mechanism contamination, or ammunition.

We recommend

Before ordering, provide the seller or gunsmith with the firearm's full model name, gauge, and serial number and confirm that the required part is B133800054. Type 1 and Type 2 springs may look similar, but their compatibility should not be judged by photo or measurements alone.

If your firearm experiences misfires, have the entire firing mechanism checked. In addition to the mainspring, a weak strike can be caused by a worn or dirty firing pin, damaged spring guide, incorrect assembly of the mechanism, or specific ammunition. The gunsmith should also assess whether to replace only one spring or service both firing mechanisms at the same time.

During installation, the firearm must be completely unloaded and all ammunition removed from the work area. Since the spring operates under tension and directly affects the trigger and firing mechanism, we recommend that installation and subsequent function checks be performed by a qualified gunsmith.

Original Type 2 mainspring for Browning B725

Browning B133800054 is an original, precisely coded mainspring for servicing the B725 Type 2 / Gen 2 mechanism. When matched to the correct model and gauge, it helps restore the firing mechanism's factory reliability and avoids the use of randomly chosen universal spare parts.

We recommend using the services of an experienced gunsmith to replace any spare parts.