The Matech Picatinny Backup Iron Sight is the standard issue BUIS for all new and fielded U.S. Military M4 carbines and M16 flat top rifles. Rigorously tested at Fort Benning and Aberdeen Proving Grounds, this sight has the strength, durability, and accuracy to meet your sighting requirements.

Features:

• Compatible with any Picatinny style rail system.
• Designed by Picatinny engineers.
• One-touch flip up aperture for instant utilization.
• Extremely low reflective signature.
• Precise range & windage adjustments up to 600 Meters.
• Tested to retain zero under extensive firing conditions.
• Can be used in conjunction with almost any standard optic
  
  NSN: 1005-01-484-8000