JMac Customs 4C-12 4-Port Muzzle Brake for Mobil Choke Shotguns Black Nitride Black. 5 (not assembled).Lightweight and RigidModular Design - Brace/Stock with many mounting optionsIntegrated QD Sling Socket8'' Length7075 T6 AluminumHard-Coat AnodizedOptional Folding Buttplate The AB-BA adapter allows you to install braces like the TailHook from Gear Head WorksAnti-Rotational design7075 T6 AluminumType 3 Hard-coat AnodizeAB-BA Socket Head Screw AB-BA Anti-Rotation Pin SM adapters utilize the factory rear trunnions and eliminate the need for additional adapters or folding mechs.This version of the SM stock/brace adapter is specifically made for 4.5mm pin folding stocks. 4.5mm trunnions can be found in the SLR 104/106/107 UR/CR/FR. Cheek wield is adjustable by moving the stock/brace up or down on the adapter.2 height positions7075 aluminumBlack hardcoat anodize finishIncludes mounting bolt for lower hole Specifications for JMac Customs 4C-12 4-Port Muzzle Brake for Mobil Choke Shotguns: Manufacturer: JMac Customs Color: Black Finish: Nitride Fabric/Material: 17-4PH Stainless Steel Gun Make: Kalashnikov Length: 4.7 in Weight: 5.11 oz Features of JMac Customs 4C-12 4-Port Muzzle Brake for Mobil Choke Shotguns 2 QD Sling points Drilled and Tapped for Cheek Risers Package Contents: JMac Customs 4C-12 4-Port Muzzle Brake for Mobil Choke Shotguns JMac Customs RRD-4C-12-Mobil: 4C-12 4-Port Muzzle Brake for Mobil Choke Shotguns Black Nitride Black