Remington 870 lesson 1

[MSDuckmen]

This will be a 24 part lesson and this is only the intro. Starting tommorrow I will start taking pictures and will add to this thread as often as I can type up the lesson and prepare the pictures for the web.

INTRO.

The Remington Model 870 was introduced in 1950 to replace the Model 31, it has been made in a wide variety of sub-models, but all have the same basic mechanism. The trigger group design is a particularly notable, having made it’s first appearance in the Model 11-48 autoloader, and used with only slight variation in every Remington rifle and shotgun auto or slide action made since. The 870 is a Simple and reliable gun. The Gun comes in 12,16,20,28 gauges, and 410 bore. There are a verity of Magnum gauges.

Below is a break down of the gun, It may be slow in building the picture but it has to be good enough to view and read.

Next is the trigger housing

Next lesson will start with Disassembly

 

[MSDuckmen]

.Disassembly
Open the action, and unscrew the magazine cap and remove it. Pull the barrel straight toward the front

Insert a screwdriver into the hole in the magazine spring retainer and pry the retainer in equal increments, to avoid warping it. Caution: The magazine spring is under tension, so control the retainer and ease it out. Remove the spring, Plug, and follower form inside the tube.

 

[MSDuckmen]

Move the action slide back to the front, bringing the bolt to the closed position, and set the safety in the on-safe position. Push out or use a punch and remove the large and small cross pins at the lower edge of the receiver toward either side.

Remove the trigger group downward, tilting it slightly as it emerges to clear the arm of the slide lock on the left.

Restrain the carrier by resting a thumb on the carrier dog, and push out the carrier pivot, which is also the front cross-pin sleeve.

Slowly release the tension of the carrier spring, and remove the carrier upward and toward the front. Remove the carrier spring and the plunger form the right side of the trigger housing. Note that the carrier dog and its washer/plate are retained on the rear wing of the carrier by a cross-pin that is riveted in place. If removal is necessary for repair, be sure the wing of the carrier is well supported before attempting the remove of the rivet

 

[MSDuckmen]

Move the safety to the off-safe position, restrain the hammer , pull the trigger, and ease the hammer down to the fired position. Keeping the trigger pulled the rear, push out the rear cross-pin sleeve toward the left and remove it.

 

[MSDuckmen]

Removal of the rear cross-pin sleeve will allow the top of the trigger to move the rear beyond its normal position, easing the tension of the combination sear and trigger spring. This spring is now easily detached from its studs on the sear and trigger and is removed upward.

 

[MSDuckmen]

Punch out the trigger cross pin.

 

[MSDuckmen]

Remove the trigger and its attached connectors upward. It will be necessary to tilt the trigger slightly to clear the left connector arm past the shelf on the housing. The cross-pin that retains the connectors on the trigger is riveted in place, and should be removed only for repair. If removal is necessary, be sure the top of the trigger is supported firmly, and take care not to deform the upper extension of the trigger.

 

[MSDuckmen]

The sear cross-pin is accessible by angling a punch on the right side into the top of the carrier spring hole. and the sear pin is nudged out toward the left for removal with smooth –jawed pliers. The sear is then removed upward.

 

[MSDuckmen]

The hammer pivot is also the pivot and retainer for the slide latch/disconnector, and the pin is riveted on the right side over the washer which is set into a recess. Unless absolutely necessary for repair, this system should be left in place. If it must be removed , be sure the assembly is well supported on the left side when driving out the cross-pin, and take care not to deform the slide latch. Use a punch that will enter the depression at the center of the cross-pin. While driving out the pin, restrain the hammer spring plunger, as the spring will be released as the pin clears the slide latch. When the pin is out ease the spring out slowly, and remove the plunger, spring, hammer, slide latch, and the round–wire slide latch spring.

 

[MSDuckmen]

Push out the small cross-pin at the rear of the housing, and remove the safety spring upward, along with the safety detent ball, if it can be shaken out. (careful not to lose the ball). Remove the safety button toward either side. If the ball can’t be taken out upward, wait until the button is removed , then use a small tool or wire to push the ball downward, for removal through the button tunnel.