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Running a magnified scope or a red dot as your primary? This FAB Defense FRBS Offset Kit in Tan rides at a 45-degree angle right alongside your main optic, so a quick roll of the rifle drops you straight onto irons for close-in work. It's the kind of insurance every optic-equipped carbine deserves. Long-range glass gets clumsy up close, batteries in electro-optics can quit at the worst moment, and weather doesn't care what you paid for your setup. That offset cant keeps a backup ready without asking you to swap or re-zero anything.
You get both halves of the equation here, the front FBS and the rear RBS, built to line up into a clean sight picture the moment they snap open. The rear runs a dual-aperture setup borrowed from the M16 family, with a smaller hole for precision and a larger one for fast, up-close target grabbing in low light. Windage lives on the rear sight and elevation on the front, and both dial in by hand with no tool hunting required. That alone puts it a step ahead of a lot of iron sights that make you fish out a bullet tip or a special key just to zero.
Construction is a mix of metal and fiberglass-reinforced polymer, which keeps the weight down around a couple ounces per sight while still shrugging off hard use. Each sight eats up a single slot on a 1913 MIL-STD Picatinny rail and clamps down with an Allen screw, so it's a genuinely quick install on any AR-15, M4, or M16-pattern gun, and it plays nicely with the FAB Defense KPOS too. One thing to keep in mind: these are meant to sit on the same plane as your handguard, so a railed gas block that sits higher or lower than the receiver won't line up right.
When the irons aren't in play, they drop into a low, sleek profile with barely any parts sticking out. That means no snagging on slings, gear, or brush while you're moving the rifle around, and no bulk cluttering up your rail. Flip them up when you need them and they lock in solid, ready to go the instant seconds start to matter.
It's a set of 45-degree canted backup iron sights meant to ride alongside a primary optic like a magnified scope or red dot. When you need a fast close-quarters shot or your optic goes down, you roll the rifle slightly and pick up the irons without swapping anything. It's a redundancy play so your carbine stays in the fight no matter what your glass is doing.
No. The rear RBS adjusts for windage and the front FBS adjusts for elevation, and both are done by hand right there on the range. That's a nice edge over some iron sights that make you dig out a bullet tip or a proprietary tool just to zero them in.
Each sight takes a single slot on a standard 1913 MIL-STD Picatinny rail and clamps down with an Allen screw, so most AR-15, M4, and M16-pattern rifles are good to go. The one catch is that they're designed to sit on the same plane as your handguard. A railed gas block that sits higher or lower than the receiver won't line the sights up properly.
This particular kit (fx-frbsost) is the right-hand offset in Tan, meaning the sights cant to the right for a right-eye-dominant setup. FAB Defense also makes left-hand versions for lefties or anyone who prefers to cant the rifle the other direction, so double-check the configuration matches how you shoot.
| UPC | 7290111586767 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | fx-frbsost |
| Shipping Weight | 0.179 |
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