Semi-Auto Shotgun Lock

So I wanted a locking mechanism for my semi-auto shotgun and I came up with this.

On my shotgun there is a slot that the charging handle travels through when it cycles. How this works is you insert the T-shaped piece (post) into that slot and twist it 90 degrees. Then you place the rectangular piece (block) over top with the round posts going into the slot and aligning the three holes through which you thread a luggage lock.

The mechanism can no longer be removed and it prevents the bolt from cycling rendering the shotgun secured from unauthorized use.

Print with high infill for strength and be careful not to drop the post into the action (I added a rounded cap to try to prevent this).

*** Added an updated version of the block that prints without supports (cut off the thin support beam after printing).