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The 1 inch extension spring is used to operate the mag release and trigger on the Caliburn.

1-inch Extension Spring


3D-printed products are not returnable and cannot be refunded once printing has begun.

Hardware and other product returns are accepted within 30-days if the product is in a resellable condition.

Defects, shipping errors, and broken parts are handled on a case-by-case basis. Please contact for additional support.

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