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Magpul
Overview
The Magpul AR-15 Flip-Up MBUS Gen 2 Tactical Rear Sight in black is a folding rear sight designed for quick deployment and low-profile storage. This non-illuminated sight enhances your aiming capability, featuring a flip-up style that allows for fast transitions between aiming devices. It's commonly found in builds utilizing a mid-length gas system and chambered in 5.56 NATO, making it a practical choice for a variety of tactical applications.
Prices checked
Magpul AR-15 Flip-Up MBUS Gen 2 Tactical Rear Sight Black is the third most added rear sight on GunPartPicker so far in October 2026, behind the Magpul MBUS Gen 3 Folding Rear Sight - Black, with about 16% of all rear sights added to builds. Down from #2 in August and September. Builds with this rear sight are mostly chambered in 5.56 NATO (78%), split between mid-length (50%) and carbine-length (29%) gas systems, and mostly AR-15 (94%).
Availability is good: it was in stock at one retailer or another nearly every day in September 2026, and today 5 of the 6 retailers we track have it in stock. Prices barely moved in September 2026, holding around $44.99, so there haven't been real sales lately. Buying today, the lowest price is $36.99 at KY Gun Company, which matches the best price we saw in September.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers
We ranked every rear sight by how often it shows up in real builds on GunPartPicker.
Read the guide: AR-15 Rear Sight Guide →The part most often added in each category by hundreds of builds that include this one
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Aggregated and anonymized data showing how builders use this product
Builds in the community that include the Magpul Ar-15 Flip-Up Mbus Gen 2 Tactical Rear Sight Black
| Build | Parts | Total |
|---|---|---|
 | 23 | $2419.32 |
 | 22 | $1371.28 |
 | 11 | $5421.38 |
 | 28 | $3326.17 |
 | 14 | $1675.57 |
 | 19 | $3705.82 |
 | 25 | $2096.59 |
 | 22 | $1733.13 |
 | 24 | $1621.59 |
 | 29 | $5100.49 |
 | 19 | $3314.67 |
 | 34 | $7158.49 |
1 global rating
Top reviews
Magpul MBUS rear flip up sight returns to zero perfectly after removal and reinstall. Spring detent holds the sight up firmly. Windage drum clicks positively. Polymer is reinforced but wont break under impact. Solid backup behind a red dot.
