Figure Safety Mechanism

b. BOLT LOCK MECHANISM —The AC-556 and AC-556K selective fire rifles are designed so that the bolt remains open after the last shot in the magazine has been fired. When the magazine is empty, the magazine follower activates the bolt lock which is designed to retain the bolt and slide in their rearward position. The bolt lock is not a safety device and should be used only to hold the bolt in its rearward position for cleaning and inspection when the chamber is empty and an empty magazine is in position in the action. The Bolt lock should not be used to hold the bolt back when there are cartridges in the magazine—a slight jar to the butt of the riflemay cause lock to disengage and a loaded round to be chambered.

To release the slide, either:

1. Remove the empty magazine, draw the cocking handle to the rear and release, or:

2. With the magazine in place, draw the cocking handle fully to the rear. Then depress the magazine follower slightly with the thumb and allow the slide to go forward.

To manually engage the bolt lock to keep the bolt open:

1. Pull the cocking handle all the way to the rear.

2. Depress the bolt lock plunger as shown in Figure 5 and allow the slide to move forward until it stops.

Ruger 556k

c. LOADING THE MAGAZINE —Use only ammunition of the proper caliber and loading. Use only ammunition which is in good condition and free from oil, grease or dirt. Do not use any "remanufactured" or hand loaded ammunition which appears to be sub-standard.

The magazine is a staggered, double row design. To load the magazine, align each cartridge with the bullet forward (pointing toward the hole in the front of the magazine body) and push downward until the cartridge snaps into place as shown in Figure 6. Do not attempt to load more than the designated number of cartridges for which the magazine has been designed. If feed problems should occur with a fully loaded magazine, load the magazine with one or two cartridges less than its total capacity.

Figure Fully Loaded Magazine

Only ball and tracer ammunition will feed normally in series through the magazine. Grenade launching cartridges and blank cartridges should be loaded in the magazine singly and fired one at a time.

d. UNLOADING THE MAGAZINE —When emptying the magazine, follow this procedure to avoid damaging the lips of the magazine: Depress the center of the second cartridge in the magazine with the end of a pencil or similar object as shown in Figure 7 and the top cartridge can be dropped out of the magazine. Repeat this procedure until the magazine is empty.

Trigger Mechanism For Bolt Fire

e. INSERTING THE MAGAZINE—See Figure 8. The magazine may be inserted with the bolt in either the closed or open position.

1. Hold the magazine at an angle as shown and insert all the way up into the magazine well.

2. Pull the bottom of the magazine toward the trigger and until the magazine latch at the rear of the magazine well engages. Check to be sure that the magazine is securely latched into place.

2. Pull the bottom of the magazine toward the trigger and until the magazine latch at the rear of the magazine well engages. Check to be sure that the magazine is securely latched into place.

Ruger 556 Trigger Unit
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  • jose
    How to take out safety ruger 556?
    6 years ago

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