New old stock extension for the M1903. Similar to the German version for the Gew98. This is a not "detachable", it extends the fixed capacity by replacing the standard floorplate.
Proof marks are light but can be found on both sides. Retainer clip (which keeps the spring and follower from flying out) are a beautiful bright blue that doesn't come across in the photos.
Last photo for reference only. Nothing except extension included in this sale. Please see my other listings! This item is in the category "Collectibles\Militaria\WW I (1914-18)\Original Period Items\United States\Personal, Field Gear".The seller is "dr_rambow" and is located in this country: US. This item can be shipped to United States.