Mag Pull Bumper for Jet Blaster Katana Mag/Clip

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9/29/18 Update:
New, better design. Note I made these looser so a square of duct tape on each corner of the mag secures instead of pure friction fit.

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I wanted to print mag bumpers after a friend of mine lost one of his magazines for several hours at a war. Why mark it with a sharpie or tape when I can print something custom?

At first I tried Jet Blaster's bumpers, but they wer