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O-Rings are vital components to the MagBlock Safety & Performance Devices.  The 1/4" Standard does securely fit the MagBlock into many weapons, however in certain cases you may need to add additional o-rings to make sure the MagBlock is secure in the magwell of your specific weapon.

The 1/4" Cold Weather allows for use in cold weather applications where there needs to be more flexibility due to climate changes.

NOTE: Does Not Include MagBlock

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