Geissele Automatics BUIS Folding Rear Sight Ddc
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Geissele
Overview
The Geissele Automatics BUIS Folding Rear Sight is a robust and lightweight rear sight designed for quick deployment and reliable performance on your AR-15. Made from durable 6061-T6 aluminum, this folding sight allows for a streamlined profile when not in use, ensuring it doesn't interfere with optics or other attachments. This rear sight is commonly found in builds featuring a mid-length gas system and chambered in 5.56 NATO, making it an excellent choice for versatile setups.
Specifications
Build history on GunPartPicker
Builders have added the Geissele Automatics BUIS Folding Rear Sight Ddc to their builds on GunPartPicker. Since April 2026, it ranks #17 of the 69 rear sights builders have added. Builds with this rear sight are mostly chambered in 5.56 NATO (88%, then .223 Wylde 13%), split between mid-length (57%) and carbine-length (29%) gas systems, and nearly all AR-15.
It was out of stock everywhere we track every time we checked in October 2026, and today none of the 2 retailers we track has it in stock right now. Listed prices start at $100.99 at Brownells for when it comes back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers
Not sure which rear sight to pick?
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
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.
Builds Featuring This Part
See all builds →Builds in the community that include the Geissele Automatics Llc Buis Folding Rear Sight Ddc
| Build | Parts | Total |
|---|---|---|
 | 21 | $5393.64 |
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