The Extendo Extender – 3D Printed 20-Round Extension For Schmeisser S60 Magazines

Luke C.
by Luke C.
extendo extender 5
Your favorite deranged TFB reader back making firearm-related abominations again. This time, Stubbs has gotten his hands on a couple of Schmeisser S60 60-round magazines and turned them into 80-round bullet bins. He has dubbed his latest creation the “Extendo Extender.”
Extendo Extender alongside two 40 round magazines with enhanced 5 round base plates
Contrary to popular belief, Stubbs does in fact actually spend money on items instead of just recycling them into modern art pieces. Each of the S60 magazines costs about $70 a piece. Accompanying the high price tag is an equally high round count, however, according to Stubbs, it wasn’t quite enough.

I asked Stubbs what inspired him to take on this latest project and he had this to say:

I’d say my inspiration for it was that I immediately took it apart to see how it worked, and I realized the floorplate was similar to Magpul’s

Extendo Extender

With that fact in mind, Stubbs also combined some 3D printing skills and got to work. Using the Strike Industries Enhanced Magazine Plates as a starting point, Stubbs designed his own magazine plate to match the wider S60 magazine.

Extendo Extender

Stubbs then printed out his piece on his home-brew 3D printer using PLA filament. Stubbs believes that his Extendo Extender can be printed on literally any 3D printer. The print file includes a dimpled area for an M5 bolt which screws into the existing S60 magazine to keep it secure. However, any similar-sized bolt will work as long as it is drilled and tapped properly. Alternatively, the extension can simply be glued on for convenience.

Extendo Extender - The high tension spring inside the ATI S60 is what makes Stubb's magazine extension possible.

While I have yet to see the magazine in action, Stubbs assures me that the extension does work just as well as when it is in its stock configuration. I’ll believe it when I see it. However, until then I have to hand it off to Stubbs, he has actually managed to make something that has a bit of utility.

For just a couple of dollars, he has turned a 60 round magazine into an 80 round magazine all for a couple bucks of PLA plastic and some time! What do you all think of this magazine extension?

Extendo Extender

You can join our Discord Chat Room to discuss TFB and TFBTV articles and videos with the community. If you would like an invite to the chat, click here. You can go yell at Stubbs there. For the faint of heart, go ahead and let er’ rip down in the comments below.

Check Prices on Schmeisser S60 60-Round AR-15 Magazines

Extendo Extender

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Luke C.
Luke C.

Reloader SCSA Competitor Certified Pilot Currently able to pass himself off as the second cousin twice removed of Joe Flanigan. Instagram: https://www.instagram.com/ballisticaviation/

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2 of 33 comments
  • MediumSizeTex MediumSizeTex on Dec 18, 2019

    Does it come with a rubber tie-down strap to keep the magazine attached, or are you expected to just have a pocket full of spare mag catches?

  • Ozzallos . Ozzallos . on Dec 19, 2019

    How close are we to dumping overpriced super plastic mag manufacturers overboard?

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