Description
FMA FBUS Gen 1 (Black) (TB-26)
The FMA FBUS Gen 1 (TB-26) is a black back-up sight from FMA’s FBUS range. FBUS is FMA’s line of back-up iron sights for railed replicas, and Gen 1 is the earlier version of the design, ahead of the later Gen 2.
If you run a red dot or scope, a set of folding back-up sights means a flat battery, a fogged lens or a damaged optic does not have to end your game. Folded flat, back-up sights stay out of your optic’s view until you need them. In black, this version suits black rails, rifles and optics.
Using back-up sights
Mount the sights on your top rail, with the rear sight towards the back of the receiver and the front sight as far forward as your handguard allows, which gives a longer sight radius and more precise aiming. Make sure they fold flat under or around your optic without touching it.
Practise flipping them up and acquiring a sight picture at home, so it is second nature if your optic fails mid-game. Then zero them at a safe backstop so they are ready when you need them.
What to check
The listing does not state whether this is a front sight, a rear sight or a pair, or how the sights adjust. Please check the product images for the parts supplied before ordering. If you only need one half of a set, compare the height with your existing sight so they line up.
Key features
- FMA FBUS back-up sight, Gen 1
- For railed replicas
- Folds out of the way of an optic
- Keeps you in the game if your optic fails
- Black finish
- FMA code TB-26
Compatibility
Designed for railed replicas. Check the product images for the mount, and make sure the sight’s folded height clears your optic and its mount before ordering.
Care and maintenance
Keep the sights clean and free of grit so the folding mechanism works smoothly, and check the mounting screws are tight before each game. A tiny drop of light oil on any hinge pin now and then helps, but wipe away any excess.
Who is it for?
For players running an optic who want reliable back-up iron sights, or anyone who prefers iron sights on a railed rifle.
Please note: Check the product images for the parts supplied. Always wear suitable eye protection when playing airsoft.









