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Every rifle running an optic needs a fallback, and the Strike Industries SPBUS covers that job without adding much weight or clutter to your top rail. These folding sights are cut from a custom SI Polymer Extreme blend and backed with a steel mounting tab and insert, so they stay light but hold up to the kind of knocks and rail time an AR sees. The clever part is what happens when you fold them down: instead of disappearing completely, they leave a built-in open sight ready for quick use, so you have backup sights on your backup sights.
A lot of budget backup sights rely on a spring that pops them up, which can mean surprise deployment at the worst moment. The SPBUS skips the internal spring entirely and uses manual deployment, so the sights come up only when you decide you need them and stay tucked away the rest of the time. Folded low, they sit clean against the rail and won't grab on gear, slings, or bag zippers when you're moving around.
Zeroing is refreshingly simple. The rear sight has a windage knob you turn by hand, and the front sight adjusts for elevation without any tools at all. The rear also runs a sliding dual aperture setup, with a larger 4.70mm opening for faster target pickup, longer eye relief, and low light, plus a tighter 1.75mm aperture when you want to squeeze out more precision. You just slide the rear up or down to switch between the two on the fly.
If your handguard and receiver have a 1913 Picatinny rail, these mount up in a few minutes. One thing worth knowing: the SPBUS sits about 2.3mm (0.09 inches) taller than standard A2 sights, so Strike designed them to run as a matched front and rear pair rather than mixing with other brands. The front sight tip also takes paint well if you'd rather run a color you can pick up quicker against a target.
Yes, these are meant to ride alongside your optic as a backup if it loses power or takes damage. Owners have had good luck running them in a 1/3 co-witness setup with common red dots. Since they sit slightly taller than A2 sights, check your specific optic height to confirm the co-witness picture you're after.
No, and that's a big part of the design. The SPBUS has no internal spring, so it uses manual deployment and only comes up when you flip it up yourself. That keeps them from popping open unexpectedly while they're folded and out of the way.
Strike Industries built the SPBUS to run as a matched front and rear pair. They sit about 2.3mm taller than standard A2 sights, so pairing one of these with a different-height sight can throw off your ability to zero. Run both together for the intended sight picture.
Both adjustments are tool-less, which makes zeroing quick. The rear sight uses a hand-turned knob for windage, while the front sight adjusts for elevation without any tools. The rear also slides between a large and small aperture depending on whether you want faster target acquisition or tighter precision.
| UPC | 793811765694 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | SPBUS |
| Style | Folding Back Up |
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