Magpul
Overview
The Magpul MBUS Gen 3 Folding Rear Sight is a rear sight. Compare prices from multiple merchants and find the best deal.
Specifications
October 2026 on GunPartPicker
Magpul MBUS Gen 3 Folding Rear Sight ranked #16 of the 30 rear sights builders added on GunPartPicker in October 2026. Builders have added it to their builds on GunPartPicker. Since April 2026, it ranks #11 of the 69 rear sights builders have added. Builds with this rear sight are mostly chambered in 5.56 NATO (64%, then 300 Blackout 18%), mostly on mid-length gas (67%, then pistol-length 22%), and mostly AR-15 (73%, then AR-9 18%).
Availability is good: it was in stock at one retailer or another nearly every time we checked in October 2026, and today only AR15 Discounts has it in stock. Prices barely moved in October 2026, holding around $56.95, with no real sale all month. Buying today, the lowest price is $56.95 at AR15 Discounts, 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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We ranked every rear sight by how often it shows up in real builds on GunPartPicker.
Read the guide: AR-15 Rear Sight Guide →Frequently Built With
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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.
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