Moriarti AR-10 .277 SIG Fury 16" Spiral Fluted Upper – Slanted Brake, 15" M-LOK

16" .277 Fury Upper: Specs & Features

Upgrade your AR-10 build with Moriarti's high-performance .277 Sig Fury 16" Upper Assembly from Moriarti Armaments. Designed for precision and reliability, this upper is compatible with DPMS low profile setups and is built for commercial-pressure .277 SIG Fury ammunition. Crafted for accuracy and strength, this upper features a spiral-fluted barrel and a slanted brake for reduced recoil. Perfect for serious shooters, it offers a unique blend of performance and durability.

Key Features:

• Barrel: 16" 4150 CMV medium profile, chambered in .277 Sig Fury, 1x7 twist, medium gas system, and 5/8x24 TPI. Includes a .308 barrel extension, ensuring compatibility with standard 308 AR-10 lower assemblies.
• Muzzle Device: AR-10 slanted muzzle brake reduces recoil for smoother shooting.
• Upper Receiver: A3 308 flat top upper made from billet 6000 series aluminum with black hardcoat anodization. Includes forward assist and dust cover.
• Gas System: .750 low profile gas block, stainless steel midlength gas tube, black hardcoat anodized for durability.
• Handguard: 15" M-LOK free float .308 rail system. The anodized aluminum rail ensures a solid and lightweight platform for accessories.
• Compatibility: DPMS low profile compatible, designed for 308 BCG and AR-10 Charging Handle.

Note: This upper does not include BCG or Charging Handle. Images may not be an exact representation of the product. For colored choices, we use anodized pallet, not cerakoted. WARNING: If "150 grain Sig 80,000 PSI Chamber Pressure Ammo" is used, warranty will be voided due to it causing premature parts wear. We test fire our .277 Fury uppers using SIG factory 150gr commercial ammunition. Our systems are not designed around military-spec or hybrid-case high-pressure loads.

FAQ

What ammunition can I use?

Use commercial SAAMI-spec brass-case .277 SIG Fury ammunition, such as SIG 150 gr factory loads. Do not use 6.8x51 military or high-pressure hybrid-case (80,000 psi) loads.

What lower receiver does this upper fit?

It is built for DPMS-pattern (LR-308 style) AR-10 lower receivers (DPMS low profile) and uses a standard .308 BCG and AR-10 charging handle. Check your lower's pattern before ordering, since large-frame AR dimensions are not fully standardized.

Does it include a bolt carrier group and charging handle?

No. The upper ships without a BCG or charging handle; you can add a .308/AR-10 BCG and charging handle as options on this page.

Related: .277 SIG Fury / 6.8x51 uppers · all AR-10 upper assemblies