The Shark Coast Tactical M-81 is a semi-automatic AR-15 style rifle chambered in 5.56 NATO with a 16-inch barrel. It wears an M-81 Woodland Camo Cerakote finish across the receivers and handguard, paired with an M-LOK handguard and a Picatinny top rail for optics. The rifle ships with a 30-round magazine and no factory sights. 
 

Key Specifications 

• Brand: Shark Coast Tactical 
• Model: M-81 
• Caliber: 5.56 NATO 
• Action: Semi-Auto 
• Capacity: 30+1 
• Barrel Length: 16 inches 
• Barrel Material: Chrome moly vanadium steel with a black nitride finish 
• Receiver Material: Aluminum 
• Finish: M-81 Woodland Camo Cerakote 
• Weight: 6.60 lbs 
   

Detailed Features 

• Threaded 1/2x28 muzzle accepts common muzzle devices 
• M-LOK handguard gives room for lights, grips, and other accessories 
• Picatinny top rail accepts a red dot or scope, since no sights ship with the rifle 
• 1:7 twist barrel handles a wide range of 5.56 bullet weights 
• Adjustable length of pull and a black polymer pistol grip round out the furniture

Owners of AR-15 pattern rifles like the M-81 tend to judge them mainly on how they run once broken in. Direct-impingement guns in this class usually cycle fine with quality ammunition, though a few owners mention wanting to clean and lube the action more than expected before it smooths out.

The M-LOK handguard and standard AR grip make the M-81 easy to configure for range use or home defense, and the Picatinny rail leaves the optic choice open. Shooters who expect irons out of the box are sometimes caught off guard that none ship with the rifle.

Because it follows the AR-15 pattern, the M-81 draws from a huge pool of aftermarket triggers, stocks, and rails, which owners like for tailoring fit. The Woodland Cerakote finish gets mixed reactions: some like the retro camo look, others would rather have flat black or FDE.