Trinity Force AR-15 Polymer UL - B.U.S Flip-Up Sight Set

Name: Trinity Force AR-15 Polymer UL - B.U.S Flip-Up Sight Set
Brand: Trinity Force

Trinity Force · Sights & Optics

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Best price

$16.95at AR15Discounts

checked Oct 31, 2026

Buy at AR15Discounts

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Store	Price	Availability	Buy	Add to build
AR15Discounts Best price	$16.95checked Oct 31, 2026	Check store	Buy at AR15Discounts
Dirty Bird	$19.95checked Oct 31, 2026	Check store	Buy at Dirty Bird

Prices and availability change often, so confirm on the store's site before you buy. We may earn a commission from these links.

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Dashed line = out of stock. Tracking since Oct 28, 2026.

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Store	Latest	Lowest	Highest
AR15Discounts	$16.95	$16.95	$16.95
Dirty Bird	$19.95	$19.95	$19.95

Since Oct 28, 2026.

About this part

The Trinity Force AR-15 Polymer UL - B.U.S Flip-Up Sight Set is an iron sight from Trinity Force. It's sold by 2 stores, from $16.95 to $19.95.

Specifications

Manufacturer: Trinity Force
Type: Iron Sights
Magnification class: 1x (non-magnified)

From the manufacturer

The Trinity Force UL - B.U.S. (Back-Up Sight) can be used as both a backup sighting system for rifle optics or as a primary sighting system. These polymer sights are equipped with an internal quick-deploy mechanism that can be activated by pressing the body of the sight forward along the axis of the firearm.The Trinity Force UL - B.U.S. is designed to attach to any standard MIL-STD 1913 rail system and fits securely using the locking cross bolt and clamp system. To mount the sight, loosen the cross bolt nut and remove it completely from the sight base. Slide the sight onto the MIL-STD 1913 rail, then insert and re-tighten the cross bolt nut, securing the sight to the rail. Weight (oz)2.4 Width (in)2.5 Length (in)1.6 MaterialHigh Strength Steel, Reinforced Polymer ColorBlack