This is what 2A Armament says :
The X4 brake is a muzzle device for large bore applications. The X4 was developed with a large initial chamber that provides a reactive surface for gasses to mitigate recoil. The secondary chamber provides some compensating effect. The X4 was tuned to provide a softer felt impulse over traditional brakes. The X4 is a welcome addition to any large bore rifle.
Features:
7.62mm/.308 caliber or smaller applications
Made from U.S.A. Certified 4140 bar stock
Blasted and black phosphate coated
Threaded 5/8 x 24 TPI for common applications
Length: 2.75 inches
Weight 3.0 oz
Product of Idaho, MADE IN THE USA
SKU (2A-BRAKE-X4)
X4 Muzzle Brake
SKU: 2A-BRAKE-X4
$89.00 Regular Price
$84.55Sale Price