Add four rounds of capacity to your Tikka T1x .22lr 10 round magazine with the MKM Tikka T1x .22lr +4 Extension. Redesigned shape for increased strength and durability. Printed from durable nylon 11 material on our state of the art HP Multi Jet Fusion machine. Easily installs in under a minute, simply remove baseplate and press on extension. Extremely lightweight, lifetime warranty, and made in the USA! Reuses stock spring and follower. Stock Spring may need to be stretched to accommodate additional rounds. If you do not want to stretch the stock spring you can install the included spacer to change the extension to a plus 2 rounds