To Clear A Malfunction

If a jam occurs, immediately put the safety selector in the "Load-Unload' position and be certain the muzzle of the rifle is at all times pointing in a safe direction.

Then study the situation to determine the nature of the jam and how best to clear it.

-If a cartridge or fired case is caught between the bolt and the barrel, or against a cartridge that is in the chamber, open the magazine. Then retract the bolt fully and remove the jammed cartridge or case.

-When attempting to extract a cartridge that is "stuck" in the chamber do not use any type of tool that is likely to act as a "firing pin" and discharge the cartridge should the tool impact on the primer.

-After clearing a jam, inspect the gun mechanism to determine if dirt might be the cause of the problem. Excess lubricant or grease can cause cartridges to feed sluggishly or fail to extract. An accumulation of grease or dirt on the face of the bolt, under the extractor, in the chamber, or in the magazine can contribute to cartridge feeding problems. (See section on "Care and Cleaning" page 22).

-After clearing a jam, inspect all cartridges that have been removed from the gun. Safely dispose of any cartridges which are in any way damaged.

-If it appears that the rifle is not at fault and that the jam was caused by the type of cartridge being used, then try another type.

-Examine your fired cartridge cases. If they have split, blown or bulged heads, stop using that ammunition and promptly return the rifle to the factory for examination.

-If the above procedures do not result in a smooth and reliable feeding firearm, don't use the rifle. The RUGER® M-77® MARK IIcan be returned directly to our Newport Product Service Department for inspection and repair, if required. See the "Service and Parts Policy" section of the manual for packing and shipping information.



If a cartridge hangs up, jams, or binds when being chambered or when being fed from the magazine into the chamber, do not attempt to force it into the chamber by pushing or striking the bolt handle.

Most failures of a cartridge to feed or to chamber are caused by improper loading of the magazine or ammunition that is incorrect or defective.

Whatever the cause, the gun user must, above all, recognize that jams can result in the very potentially dangerous situation of a cartridge discharging before it is chambered. If this occurs, the cartridge case will rupture and its fragments will fly out of the gun with sufficient force to cause injury. Always wear shooting glasses and hearing protectors!


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  • Haiduc
    How to clear a jam in a rifle?
    9 years ago
    How to clean a ruger m77 mark ii?
    9 years ago

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