The Troy Industries Rear Folding Tritium BattleSight (brand part number SSIGFBSRTBT00) is a rail-mounted backup rear sight built for AR-15 rifles that need reliable aiming in low light. Troy Industries houses a tritium insert in the round aperture, so the sight glows continuously off the ambient decay of the tritium itself with no batteries to charge or replace. It folds down flat against the rail when not needed and pops back up to a repeatable, factory-zeroed height without any permanent modification to the rifle. Finished in black hardcoat anodizing, it’s built to take the abuse of daily carry and range use while holding its zero.

Key Specifications

• Houses a tritium insert that glows continuously without batteries or ambient light.
• Uses a round aperture sight picture.
• Folds flat against the rail and returns to a repeatable, factory-zeroed height.
• Mounts and removes without any permanent modification to the firearm.
• Finished in black hardcoat anodizing for durability.
• Machined with a serrated ramp to cut glare off the sight body.
• Built as a rail-mounted alternative to a fixed A2 rear sight.
• Requires a same-plane rail system matched to the front sight height.
• Not compatible with a raised or lowered gas block rail relative to the receiver.

Frequently Asked Questions

Does this sight need batteries? No, the tritium insert glows continuously from its own radioactive decay, with no batteries or charging required.

Will it work with any gas block rail? Only if the gas block rail sits on the same plane as the receiver height; raised or lowered rails will not let the sight zero properly.

Can I remove it without altering my rifle? Yes, it mounts and removes from the rail without any permanent modification.

Buy the Troy Industries Rear Folding Tritium BattleSight

Add a reliable, always-on backup sight that folds out of the way until you need it. Order it from our Troy Industries lineup, part of our gun sights selection, at our Lubbock, Texas gun shop for fast, direct shipping.