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This is a magnetic gun rest for your gun safe, vehicle, etc. it uses a Harbor Freight magnet pack. 

Ceramic Magnet Assortment, 16-Piece 

or any rectangle magnet that is .375 (3/8) x .0875 (7/8) x 1.875 (1 7/8) for the harbor freight magnet it has enough magnetic pull through the top of the rest where the barrel sits to have it be a bit more secure. The magnet sits just slightly lower in the print to prevent damage to vehicles and to leave a bit of room for super glue. Its tight fit.

The barrel portion is wide enough for a side by side 12 gauge 

Printed on a flashforge 5m pro in PLA with a .4mm nozzle. 15% infill grid pattern