WTF are Backup Iron Sights For?
Backup iron sights (BUIS) are crucial for long-term field reliability, not just mid-gunfight failures. Optics can fail due to environmental factors like temperature shifts causing internal fogging, or physical impact. Fixed optic mounts can be removed in the field using common tools stored in rifle grips, and offset sights offer faster deployment than QD mounts if immediate backup is needed.









