The MBUS is a low-cost, folding back-up sight. The rear sight is adjustable for windage and fits most 1913 Picatinny receiver rails, but is specifically tailored to the AR15 / M16 platform, retaining the same height-over-bore.
The sight has a larger and smaller aperture and the sight can be folded down no matter which one you have chosen.
Windage adjustment
Each click is retained by a detent. The effect of one click is roughly as follows:
- 0.7 MOA (19.2 mm / 100 m or 0.73" / 100 yd) with the sight radius of a 14.5" carbine
- 0.5 MOA (13.9 mm / 100 m or 0.52" / 100 yd) with the sight radius of a 20" rifle
The included leaflet says the adjustment range of these sights is fine for rifles but you could run into issues trying to zero a pistol-caliber carbine to longer distances due to the snowball-like trajectory. (This affects the front sight only, but may be noteworthy for rear sight buyers as well.) Savvy in trigonometry and ballistics as we are, we think you can overcome this by mounting the front and rear sights closer to each other. It's not like your PCC is very accurate and frankly, you're probably no marksman, either.
Notes on installation
To keep the construction more simple and durable, the claw is fixed and slides onto the rail either from the front or rear. Once the sight is in position, a crossbolt locks it into the chosen Picatinny slot and tightens the grip to keep it zeroed. You'll need a 1/8" allen key or something flat for tightening the crossbolt but don't overdo it!
| Deployed | Stowed | |
|---|---|---|
| Height above rail | 1.54" | 0.51" |
| Length on rail | 1.5" | 2.6" |
| Height above rail | 39 mm | 13 mm |
| Length on rail | 38 mm | 66 mm |
| Weight | 37 g / 1.3 oz | |
Made in USA