Muzzle Crowns, Flash Hiders, Compensators, and Brakes
Muzzle Crowns
The muzzle crown is simply the face of the barrel at the muzzle. The geometry of the muzzle crown can range from flat, to donut shaped, or to any a number of recessed shapes. Target crowns are typically stepped or cut in a cone shape. The purpose of the recessed crown is to protect the bore of the barrel at the muzzle from damage. All Bison Armory barrels with unthreaded muzzles feature 11 degree target crowns.
Muzzle Devices
Muzzle devices include flash hiders, compensators and brakes.
Flash Hiders
Flash hiders are used for cosmetic and functional purposes. A flash hider is a device attached to the muzzle of a rifle to protect the muzzle crown and to reduce the visible signature of the burning gases that exit the muzzle. Bison Armory offers the following flash hiders:
Surefire SF3P-68
Smith Vortex
PWS Triad
Compensators
Compensators are similar to flash hiders except that they are also designed to compensate for the effects of recoil. This is typically accomplished by closing off ports that would be on the underside of the flash hider so that the gases exiting the muzzle are forced upwards and laterally. The change in momentum of the gases has an equal opposite effect that applies a force the muzzle that acts downwards. This effect helps keep the shooter on target and decreases the time for follow up shots. Comps available from Bison Armory are:
Armalite A2
BRT Linear Comp - Fluted and Smooth
PWS FSC30
Muzzle Brakes
Muzzle brakes are like compensators except that they are closed at the end. This feature forces some of the gases exiting the muzzle to move laterally. The decrease in forward momentum of the gases results in force acting forward on the barrels, which reduces the recoil perceived by the shooter. Muzzle brakes available from Bison Armory are:
Troy Medieval
Troy Claymore Linear Brake 
PWS PRC
PRI QC Brakes - Tapered
PRI QC Brakes - Straight
Surefire MB68K
Ops Inc brake and collar for use with 12th Model silencer
