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Magpul
Overview
The Magpul MBUS Rear Flip-Up Back Up Sight Gen 2 in black is a polymer folding sight designed for quick deployment and reliability in various shooting conditions. This rear sight pairs seamlessly with a front sight to provide a robust backup aiming solution, ensuring that your rifle remains functional even if your primary optics fail. Commonly found in tactical and multi-purpose builds, this sight is valued for its lightweight construction and ease of use.
Specifications
November 2026 so far on GunPartPicker
Magpul MBUS Rear Flip-Up Back Up Sight Gen 2 Black is the sixth most added iron sight on GunPartPicker so far in November 2026, behind the Magpul MBUS Gen 3 Folding Rear Sight, FDE - MAG1167-FDE, with about 3% of all iron sights added to builds. That's its 3rd straight month at #6. Builds with this iron sight are mostly chambered in 5.56 NATO (75%, then 300 Blackout 12%), split between mid-length (41%) and carbine-length (35%) gas systems, and nearly all AR-15.
Availability is good: it was in stock at one retailer or another nearly every time we checked in October 2026, and today only Optics Planet has it in stock. Prices barely moved in October 2026, holding around $35.95, with no real sale all month. Buying today, the lowest price is $35.95 at Optics Planet, which matches the best price we saw in October.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers
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Build Configuration Breakdown
Aggregated and anonymized data showing how builders use this product
PlatformBased on real build data showing which platform (AR-15, AR-10, AR-9) builders pair with this product.
CaliberBased on real build data showing which calibers builders choose alongside this product.
Gas SystemBased on real build data showing which gas system lengths builders use with this product.
Builds Featuring This Part
See all builds →Builds in the community that include the Magpul MBUS Rear Flip-Up Back Up Sight Gen 2 Black
| Build | Parts | Total |
|---|---|---|
 | 30 | $5705.38 |
| 26 | $3837.93 |
 | 20 | $4023.35 |
 | 24 | $1255.44 |
| 16 | $1927.22 |
 | 16 | $1666.82 |
 | 23 | $2743.73 |
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