Ulfhednar Troll Muzzle Brake .30/.26 /.24. It is made of 7075 aluminum which is comparable in strength as several types of steel but is much lighter. The weight is only about 80 grams The brake comes with 3 steel inserts which allow it to switch between calibers .30 .264 and .24. It's 3 brakes in one The locknut ensures that the brake will always be perfectly mounted. Due to the low weight there is minimal point of impact change compared to other brakes we have tested. We've also never shot with a brake that reduces the recoil as much as this one Specifications for Ulfhednar Troll Muzzle Brake: Manufacturer: Ulfhednar Weight: 85 g 3 oz Quantity: 5 Fabric/Material: 7075 Aluminum Features of Vision Products Troll Muzzle Brake 5/8x24 threaded with an adapter for 1/2x28 (AR-15/M16) threads Package Contents: Ulfhednar Troll Muzzle Brake Ulfhednar VISION-803: Troll Muzzle Brake .30/.26 /.24