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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.
Magpul AR-15 Flip-Up MBUS Gen 2 Tactical Rear Sight Black was the second most added rear sight on GunPartPicker in August 2026, behind the Magpul MBUS PRO Rear Sight - Black, with about 14% of all rear sights added to builds. Down from #1 in July. Builds with this rear sight are mostly chambered in 5.56 NATO (65%, then .223 Wylde 15%), split between mid-length (45%) and rifle-length (25%) gas systems, and mostly AR-15 (88%, then AR-10 8%).
Availability is good: it was in stock at one retailer or another nearly every day in August 2026, and today 4 of the 5 retailers we track have it in stock. Prices barely moved in August 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 August.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 31 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 the 203 builds that include this one
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Bravo Company Manufacturing 5.56 NATO Mid-Length Bhf AR-15 Barreled Upper - MCMR-15 - 16"
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Magpul AR-15 MOE Stock Collapsible Mil-Spec Black
EOTECH XPS2 Holographic Sight, Tan - XPS2-0TAN
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 | $2398.06 |
 | 22 | $1362.41 |
 | 11 | $5425.89 |
 | 28 | $3248.85 |
 | 14 | $1675.95 |
 | 19 | $3677.82 |
 | 25 | $2091.33 |
 | 22 | $1779.43 |
 | 24 | $1490.35 |
 | 29 | $4995.04 |
 | 19 | $2978.06 |
 | 34 | $7012.91 |
2 global ratings
Top reviews
Magpul MBUS Pro 2 rear sight works correctly. Mine needed a re-zero session after the first range trip because the windage drum had moved a hair from the initial setting. Now its solid. Worth doing two zero sessions to confirm initial setup.
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.
