12 Gauge Insert

You can now buy a 12 Gauge Insert Adapter to shoot cheaper 12ga Flares out of a 26.5mm Flare Pistol.  US Marine 12ga signal flares are considerably cheaper than the full sized European 26.5mm flares.

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American Owned and Operated


20+ Years In Business


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Ships from Pennsylvania


Warning:  Any attempt to modify this insert to accept anything other than 12ga marine flares could be a criminal act.  Attempting to fire anything other than 12ga marine flares from this insert could be fatal.

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United Defense Products
Overall Rating
Must have item
Review by happy owner
This is great quality, all aluminum. I had to sand the rim a little to chamber it in my HK clone flare gun.
Overall Rating
essential for the flare gun
Review by Michael
Works great in the polish surplus flare gun! I little sanding and it fits like a glove!
Overall Rating
great addition for 26.5 flare gun.
Review by don
As others say, requires grinding it down to hat my polish flare gun to close with it in it. Not a deal breaker. Save your expensive 26.5 mm flares and use 12 gauge, saves money and gives you options.
Overall Rating
Good to have
Review by Alex
These are a good value and good to have on hand. It's harder to find and more expensive to acquire 26.5mm flares compared to 12 gauge marine flares. Depending on what country made your flare gun, and the model, you will have to do some sanding for it to fit. Not a big deal to do.
Overall Rating
Review by Charles
The only complaint I have is that the description omits that this product needs to be modified for many common flare guns. I still would have bought it, but a heads up would have been nice.
Overall Rating
Great but need to sand
Review by Sammy
Great item much cheaper than the 26.5mm flares but you need to sand down the adapter to fit 99% of flare guns after that works great. Buy it now
Overall Rating
Excellent quality conversion for military flare guns!
Review by Shaun
Purchased this for a Czech vz.44 flare gun - item worked flawlessly after filing around the rim of the insert (the part the extractor grabs needs to be reduced by just a hair to work with my flare gun).

A lot of customers mention the filing - what I haven't seen anyone mention yet is the instructions that come with the insert that explain why the filing is necessary. Apparently, the GECO flare guns coming out of Germany are built to slightly different specs than the Warsaw pact flare guns that are floating around. Instead of designing a different insert, the manufacturer included instructions about how to modify the insert to fit different flare guns. The filing is not difficult - if you've got sandpaper handy you can take care of it while watching your favorite TV show.

Ultimately, this is a pretty indispensable accessory if you've got a 26.5mm flare gun, especially if you plan to use it as an emergency distress signal.
Overall Rating
12 Gauge
Review by William
Needed to do some filing for it to fit into my Polish flare gun but is well built and does its job.
Overall Rating
Worked well after modification
Review by WG
Got one of these for my Polish flare gun. It fit well, but I had to file down a section in order to close the flare gun.
Overall Rating
26.5mm 12 gauge insert
Review by bart
This is an awesome accessory for anyone with a 26.5 mm flare gun, 12 gauge flares work flawless and is a lot cheaper to use.
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