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Magpul
Overview
The Magpul MBUS Gen 3 Folding Rear Sight is a durable polymer sight designed to provide a reliable aiming solution for your AR-15. Its folding design allows for a low-profile setup when not in use, ensuring that it won't interfere with optics or other accessories. This rear sight typically features on builds that utilize a mid-length gas system and chambered in 5.56 NATO, making it a solid choice for a variety of configurations.
Magpul MBUS Gen 3 Folding Rear Sight, Black - MAG1167-Black
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Prices checked
Magpul MBUS Gen 3 Folding Rear Sight, Black - MAG1167-Black is the second most added iron sight on GunPartPicker so far in October 2026, behind the NCSTAR PRO Series Sight Front/Rear Flip Up, Black - VMARFLC, with about 15% of all iron sights added to builds. That's its 2nd straight month at #2. Builds with this iron sight are mostly chambered in 5.56 NATO (79%, then 300 Blackout 9%), split between mid-length (48%) and carbine-length (34%) gas systems, and nearly all AR-15.
Availability is good: it was in stock at one retailer or another nearly every day in September 2026, and today 9 of the 10 retailers we track have it in stock. It dipped to $37.99 at KY Gun Company for a stretch in September 2026, well under its usual $47.99 to $56.95, so sales do come around. Buying today, the lowest price is $37.99 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 iron sights by how often it shows up in real builds on GunPartPicker.
Read the guide: AR-15 Iron Sights 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 MBUS Gen 3 Folding Rear Sight, Black - MAG1167-BLK
| Build | Parts | Total |
|---|---|---|
 | 25 | $2096.59 |
 | 33 | $6545.23 |
 | 27 | $3051.08 |
 | 28 | $3274.72 |
 | 19 | $1082.46 |
 | 29 | $2239.87 |
 | 27 | $5306.68 |
 | 8 | $985.89 |
1 global rating
Top reviews
gen 3 is lower profile than the gen 2, sits flatter under an LPVO. spring tension feels right, deploys positive with a thumb flick. one note, my zero shifted maybe an inch at 50 after the first range session as the picatinny clamp settled, retuned and its held since
