Increase the capacity of your Buckmaster PB12 Shotgun with the Ignition Custom Engineering Magazine Extension LKit.

Options to increase by +2 additional shots or +5 additional shots.

No permanent modifications required to the shotgun for most models (some models may have a longer magazine tube which may require cutting*).

Instructions provided (requires disassembly of shotgun). 

Ausralian made. Manufactured by the gunsmiths at our Adelaide workshop.

Kit Includes:

  • Magazine Extension Tube +2 or +5 capacity (finished in hard wearing Cerakote)
  • 10 Shot Magazine Spring (+5 kit only)
  • Ultralite Barrel Clamp
  • Hex Magazine Nut
  • Instructions 

Which Kit Size Is Best For Me?

20" barrel shotgun: we recommend using the +2 kit on a 20" barrel model as the extension will be roughly the same length as the barrel muzzle.

28" barrel shotgun: You can use the +2 kit or the +5 Kit (the +5 extension will be roughly the same length as the barrel muzzle).


What Barrel Clamp styles do you offer with the kit?

The kit is available with an Ultralite Style or Tactical Style clamp:

Ultralite clamp

Tactical Clamp (with removable picatinny rail - rail can be mounted on the left or right)



What are the dimensions of the clamp? Will it fit on any shotgun?

There is slight variation among shotgun models (and even among the same models). To determine if this clamp is a good fit for your shotgun, measure from the centrepoint of the barrel to the centrepoint of the mag tube.

If your distance is slightly smaller (within 1-2mm) the clamp will fit, you may find a slight taper of the mag tube in longer tubes. This does not usually affect function and to reduce the appearance of the angle, fit the clamp as closer to the reciever as possible.


Tactical clamp



You are responsible for ensuring this item complies with your local state or territory laws and regulations, and comply with any registration or notification requirements before purchase. You are also responsible for ensuring compatability before purchase. We do not accept returns on this item for change of mind or non compliance with regulations. You may be asked to provide a copy of your fireams license before this item is shipped.


Brand Ignition Custom Engineering
Shipping Weight 0.4000kg

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