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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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Magpul MBUS Gen 3 Folding Rear Sight, Black - MAG1167-Black was the third most added iron sight on GunPartPicker in August 2026, behind the Midwest Industries AR-15 Combat Rifle Folding Sight Set, with about 10% of all iron sights added to builds. That's its 2nd straight month at #3. Builds with this iron sight are mostly chambered in 5.56 NATO (60%, then 300 Blackout 40%), mostly on carbine-length gas (67%, then mid-length 33%), and nearly all AR-15.
Availability is good: it was in stock at one retailer or another nearly every day in August 2026, and today 8 of the 10 retailers we track have it in stock. It dipped to $37.99 at KY Gun Company for a stretch in August 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 August.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 31 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 the 147 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 | $2091.33 |
 | 33 | $6482.44 |
 | 27 | $2840.08 |
 | 28 | $3240.10 |
 | 19 | $1152.37 |
 | 29 | $2167.24 |
 | 27 | $5286.28 |
 | 8 | $985.85 |
2 global ratings
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
clear glass. wish the brightness adjustment was easier
