This is a piston-driven, AR-15-style semi-automatic rifle chambered in 5.56 NATO with a 16-inch cold hammer forged steel barrel cut with a 1:7 twist. It runs Sig Sauer's short-stroke piston system with an adjustable gas system, feeds from a 30-round magazine, and is finished in anodized black. The rifle has a free-floating M-LOK handguard and a Magpul stock, giving it a modern configuration built on Sig's proven 516 platform. 
 

Key Specifications 

• Brand: Sig Sauer 
• Model: 516 Mohawk 
• Caliber: 5.56 NATO 
• Action: Semi Auto 
• Capacity: 30 rounds 
• Barrel Length: 16 in 
• Finish: Anodized Black 
   

Detailed Features 

• Short-stroke piston operating system with an adjustable gas system for tuning to ammunition or conditions 
• Cold hammer forged 16-inch steel barrel with a 1:7 twist and threaded muzzle 
• Free-floating M-LOK handguard for mounting accessories directly to the rail 
• Rear and side non-reciprocating charging handles for manipulation from either side 
• SIG Matchlite DUO curved trigger and a Magpul DT stock 
• Steel-reinforced cam path and feedramp for high-wear durability

Owners of piston AR-15-style rifles like the 516 Mohawk generally point to the piston system running cleaner than a direct-impingement gun, with less carbon blown back into the action. The tradeoff some note is a bit more weight up front from the piston operating rod compared to a standard AR.

Handling-wise, the free-floating M-LOK handguard and ambidextrous, non-reciprocating charging handles get praised for making the rifle easy to run for both right- and left-handed shooters, and the Magpul stock is a familiar, adjustable setup that most AR owners already know. The SIG Matchlite DUO trigger tends to draw favorable comments for a crisper break than a stock mil-spec trigger.

On value and aftermarket, the 516 sits in Sig's higher-end AR-15-style lineup, and buyers weigh the piston system and included furniture against a comparably equipped direct-impingement rifle. Because the platform accepts standard AR-15 magazines, furniture, and optics, aftermarket support and parts availability are not a concern for most owners.