Trijicon Replacement Set for TA01NSN Back Up Iron Sights. This Trijicon Back Up Sight is made using incredibly durable materials that are guaranteed to be long lasting and efficient. The Trijicon TA01NSN Replacement Back Up Iron Rifle Sight is an amazing addition to the Trijicon line of high end Rifle Scope Equipment. For a great way to make sure you are always ready for action choose the Trijicon TA01NSN Back Up Replacement Iron Sights. Specifications for Trijicon Replacement Iron Back Up Sights: For: TA01NSN Features of Trijicon Iron Replacement TA01NSN Rifle Sight: Durable Lightweight Designed for TA01NSN Package Contents: Trijicon Back Up Replacement Iron Sight Set for TA01NSN AC10009 AC10009: Trijicon Back Up Iron Sight Replacement Kit - For TA01NSN