Ultradyne USA C4 Offset Folding Rear Sight
Click to see full view
Ultradyne
Overview
The Ultradyne USA C4 Offset Folding Rear Sight is designed for quick deployment and added versatility on the AR-15 platform. This folding sight features an offset design, allowing builders to maintain a low profile while providing rapid sight acquisition in various shooting scenarios. Commonly found in builds utilizing a carbine gas system and chambered in 5.56 NATO, it enhances the functionality of your rifle without adding unnecessary bulk.
Specifications
Available Merchants(4)
Prices checked
Price Alert
October 2026 on GunPartPicker
Ultradyne USA C4 Offset Folding Rear Sight was the seventh most added rear sight on GunPartPicker in October 2026. Builders have been adding it to their builds on GunPartPicker since February 2026. All time, it is the seventh most added rear sight on the site. Builds with this rear sight are mostly chambered in 5.56 NATO (72%, then .223 Wylde 11%), split between mid-length (51%) and carbine-length (33%) gas systems, and mostly AR-15 (92%).
Availability is good: it was in stock at one retailer or another nearly every day in October 2026, and today 2 of the 4 retailers we track have it in stock. Prices barely moved in October 2026, holding around $159.99, so there haven't been real sales lately. Buying today, the lowest price is $258.99 at Palmetto State Armory, above October's low of $159.99, so a better deal may come 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
The part most often added in each category by hundreds of builds that include this one
LMT MARS-LS PDW Complete Ambidextrous AR-15 Lower Receiver
Ultradyne USA C4 Offset Folding Front Sight
Geissele Automatics AR-15 SSA-E X Lightning Bow Trigger
Daniel Defense Collapsible Mil-Spec Buttstock, Brown - 21-091-04179-011
Streamlight ProTac Rail Mount HL-X Laser 1000 Lumen Weapon Light with Tape Switch - CR123A
EOTECH 3x30.5mm X 21.6mm Holographic Hybrid Green Dot Sight - HHSGRN
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.
Builds Featuring This Part
See all builds →Builds in the community that include the Ultradyne Usa C4 Offset Folding Rear Sight
| Build | Parts | Total |
|---|---|---|
 | 24 | $6984.78 |
 | 31 | $7663.43 |
 | 27 | $2353.12 |
 | 25 | $4766.80 |
 | 28 | $1208.85 |
 | 24 | $3570.40 |
 | 18 | $4534.37 |
No reviews yet. Be the first to review this product!