Precision Reflex 6.5mm Straight MSTN QC Brake Steel. 5mm Straight MSTN QC Brake is a great way to make sure you are shooting with optimal accuracy. This Muzzle Brake by Precision Reflex is made using a 304 stainless steel material that ensures an incredibly long lasting and durable product. The Precision Reflex 6.5mm QC Muzzle Brake has been designed to redirect your muzzle blast in a straight line so it directs the sound forward and your shots will land where you intended. This Precision Reflex Muzzle Brake can be installed without a shim allowing you to save weight by omitting this part. For a great way to make sure you are shooting with the best possible accuracy choose the Precision Reflex 6.5mm QC Straight Muzzle Brake. Specifications for Precision Reflex 6.5mm Straight MSTN QC Brake: Manufacturer: Precision Reflex Caliber: 6.5mm Grendel Fabric/Material: Stainless Steel Threads per Inch: 5/8x24 Gun Make: AR Platform Outer Diameter: 0.95 in Length: 2 in Weight: 3.4 oz Included Accessories: Spacer shims Diameter: 0.95 in Package Contents: Precision Reflex 6.5mm Straight MSTN QC Brake Precision Reflex 05-0099.: 6.5mm Straight MSTN QC Brake Steel