PRODUCT DESCRIPTION This magnetic arm lock help keep the cocking arm open. Useful during competition when you are required to keep the bolt open.FX Impact Magnetic Arm LockSKU: ST0048R 980,00PriceVAT IncludedOut of StockFeatures:6061 T6 AluminumBlack anodizedStainless steel screwEasy installWeigh only 1ozInstallation Instruction:Highly recommend you remove the bottleFire the gun to remove any air in the plenumUnscrew bolt in front of plenum. See picture 1Install Magnetic Arm Lock