Stag 15 Trinity Upper

$349.99 $299.99
You save: $50.00
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The Stag 15 Trinity Series is a partnership between Stag Arms and Trinity Force that offers a unique balance of durability and precision. The Trinity Series is built around a 16” 1/7 twist chrome-lined barrel and the Trinity Force MX-15 M-LOK Rail.

The free-floating MX-15 M-LOK Rail offers a lightweight profile that increases ergonomics and maximizes airflow while providing superior strength and durability. The rail provides ample amount of M-LOK attachment points and an uninterrupted picatinny rail along the top, which allows for room for sights, optics and accessories the shooter may require.

This upper half does not include a BCG or Charging Handle.


Action: Semi-Auto Direct Impingement

Caliber: 5.56 NATO | .223

Twist Rate: 1/7 Button Rifled

Muzzle Device: A2 Flash Hider

Barrel: 16", 4150 Steel, Chrome Lined, Government Profile, Manganese Phosphate Coated

Handguard: Trinity Force 15" MX-15 M-LOK Rail

Receiver Material: Forged and Mil-Spec 7075 T6 Aluminum with Type 3 Hard Coat Anodizing

Bolt Carrier: None

Gas System: Carbine Length with Low Profile Gas Block

Charging Handle: None

SKU: STAG570043N

This upper half does not include a BCG or Charging Handle.

*Product images are for illustrative purposes only and may differ from the actual product.


Q: What is the warranty coverage for this upper?

A: This upper has a one year warranty.

Q: Is this upper compatible with other manufacturer's lower receivers?

A: As long as the lower accepts a mil-spec upper, all of our uppers will function properly.


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