If you want a state of the art muzzle brake engineered to address the challenges of today's competitions then you need the Phase 5 FATman Hex Break! From the brilliant master minds at Phase 5 comes the iconic Hex design for that custom styling and precision performance you're looking for. Two large FAT ventilated baffle sections and chambers dramatically reduce the felt recoil of your rifle. Two top ports feature a 20 degree forward angle to drive and direct the spent gas energy toward maintaining a flat muzzle plane for consistent results shot after shot. The first chamber wall sits as close to the barrel crown as possible to ensure that you continue to get the maximum accuracy out of your barrel. Take your rifle to the next level with the FATman Hex Break from Phase 5. 
Specifications and Features:
Phase 5 FATman Hex Break FATman-5/8-24
AR Style Muzzle Brake
Threaded 5/8x24 TPI
.300 AAC Blackout, .308 Winchester, and 7.62x51mm NATO
Ventilated Chambers and Baffle Sections
Length 3"
Width 1.26"
Weight 5.9 Ounces
Steel
Mil-Spec Black Parkerized Finish
Includes:
Crush Washer
    
            Specifications and Features:
Phase 5 FATman Hex Break FATman-5/8-24
AR Style Muzzle Brake
Threaded 5/8x24 TPI
.300 AAC Blackout, .308 Winchester, and 7.62x51mm NATO
Ventilated Chambers and Baffle Sections
Length 3"
Width 1.26"
Weight 5.9 Ounces
Steel
Mil-Spec Black Parkerized Finish
Includes:
Crush Washer
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                        Would this work on my Rossi LWC 300BLK                    
                    
                    
                            Answer:
                            Hello Ben! The standard LWC barrel is 5/8x24 TPI – same thread pattern as this muzzle brake. I've not tested it on your rifle personally, but the specifications line up correctly.
                        
                        
                    
                        Will this fit a S&W AR10?                    
                    
                    
                            Answer:
                            Yes this will fit.
                        
                        
                    
                        Can I shoot 7.62x39 through this break?                    
                    
                    
                            Answer:
                            Yes you can. If your barrel is threaded 5/8x24, then this will work with your firearm.
                        
                        
                    
                        Will this fit a Howa 1500 6.5 CM?                    
                    
                    
                            Answer:
                            It will depend on which variant you have. The Howa 1500 Elevate & HS Precision models with carbon fiber barrel and the Oryx & TSP X models with steel barrels chambered in 6.5 Creedmoor are threaded 5/8x24. The Howa 1500 Stalker & HS Precision model with steel barrel chambered in 6.5 Creedmoor are threaded 1/2x28 and this will not fit.
                        
                        
                    
                        Will this work on a 300 win mag?                    
                    
                    
                            Answer:
                            The diameter is compatible. If your 300 Win Mag's muzzle is threaded 5/8x24, then yes this will work.