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StrangerDanger

Benelli M4 -- Rear Sling Plate Removal

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BenelliM4--StandardampPistolGripStockAssembly_zps026b84b5.jpg~original

This tutorial will focus on the removal of the Benelli M4 field and pistol grip stock’s sling plate. A big thanks goes out to Benelliwerks to advising me how to get the assembly apart a few years back. I just finally figured out how to actually do it.

As you can see by the Benelli diagram above, both the field and the pistol grip stock are assembled the same way with the same components when it comes to the rear sling mount.

 

Remove the Recoil Pad (061C) from the stock by unscrewing the two self-tapping screws (062J) that are accessed from the two small holes at the rear of the Recoil Pad (061C).

IMG_0310_zpsltrjrhrh.jpg

Note: You’ll want to use a fixed blade Philips screw driver. Use a little oil or spit on the small opening at the bottom of the recoil pad. Press the screw driver into the hole until you feel it engage the screw bit.

Edited by StrangerDanger

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IMG_0311_zpsfxnadjy5.jpg

 

You can see here that the screws are the self-threading type. Be careful with these on the pistol grip and field stocks. It is easy to strip out the holes in the stock.

 

Next, look down inside the bottom of the stock and note the 13mm Stock Retaining Nut (053J). I personally prefer to put the stock in a padded vice. Having it in a vice will give you more hands to work with. Naturally you do not want to crush your stock with the vice, so use your best judgment.

 

IMG_0312_zps5bkaposw.jpg

 

Note: I’ve shown how the hardware is assembled in the bottom right corner to give you a visual reference to what you’re working on.

 

You're going to need a heat gun, because those evil Italians locktited the crap out of the threaded portions of the Stock Retaining Pin (280J). You're going to want to focus your heat through the bottom end of the butt stock on the 13mm Stock Retaining Nut (053J). Apply enough heat to let the locktite give way and remove the 13mm nut. I run the heat gun for approximately thirty seconds, and try to unscrew it. You do not want to use retard strength on this. If you try to force it, you’ll see that you’re jamming the wing of the Stock Retaining Piece (278J) into the inner body of the stock. Once the Stock Retaining Nut (053J) begins to move, the battle has been won. Remove it completely from the stock. Be careful with it though, it will likely be hot.

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IMG_0316_zpsxgocu7dl.jpg

 

Note: I’ve shown the orientation of the Stock Retaining Pin (280J in the bottom right corner of the image.

 

IMG_0315_zpsbvbwwwcq.jpg

 

Note: The removed 13mm Stock Retaining Nut (053J).

Edited by StrangerDanger

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At this point, I like to move the stock to nearly a horizontal position in the vice. It will help with putting the nut in place.

 

IMG_0317_zpsfvg68fgr.jpg

 

IMG_0319_zpswknshqha.jpg

 

Insert your 13mm nut into a 13mm deep socket with a 10 inch extension.

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Next, look down the front end of the stock with a small flash light. Notice the threaded portion in the center of the stock. This is what the stock screws into the receiver extension by.

 

IMG_0318_zps7kvpncwn.jpg

 

Next, tighten the 13mm Stock Retaining Nut over this end of the Stock Retaining Pin (280J). You want to tighten this firmly.

 

IMG_0320_zpszn9uo4ek.jpg

 

Note: Here is the nut tightened. The purpose for this is to use this nut to give you leverage on the Stock Retaining Pin (280J) so that you can unscrew it.

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IMG_0322_zps6vk7axvx.jpg

 

More heat is needed on the Stock Retaining Piece (278J). Every 20 or 30 seconds, attempt to unscrew the Stock Retaining Nut (053J) slowly while looking through the end of the butt-stock. You want to see if the Stock Retaining Pin (280J) is unscrewing from the Stock Retaining Piece (278J). If the Stock Retaining Nut (053J) simply loosens and begins to unscrew off of the Stock Retaining Pin (280J), re-tighten it and apply more heat to the Stock Retaining Piece (278J). Repeat this process until you can see the Stock Retaining Pin (280J) is unscrewing.

 

IMG_0323_zpstxcyd0op.jpg

 

The Stock Retaining Piece (278J) and the eight Field Stock Retaining Springs (279J) will fall out the end of the butt stock as the Stock Retaining Pin (280J) is removed.

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IMG_0324_zpsxiytibmy.jpg

 

Next, tip the stock forward and allow the Stock Retaining Pin (280J) and the Stock Retaining Nut (053J) to fall out the front. The Stock Retaining Nut (053J) will still be attached to the Stock Retaining Pin (280.)

 

IMG_0325_zpsfa76y6zd.jpg

 

At this point, the Sling Plate (063J) will simply pull out either side of the stock.

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IMG_0326_zps7y6luziz.jpg

 

Sling Plate (063J) Removed.

 

IMG_0328_zpsh2wfcyyb.jpg

 

I recommend that you remove the Stock Retaining Nut from the Stock Retaining Pin since you don’t want to have the nut stuck on the pin. At this point, you probably have the nut jammed on pretty tight.

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IMG_0329_zpsxnnwraqx.jpg

 

Put the Stock Retaining Pin and the Stock Retaining Nut combo into the vice carefully. Try not to mar up your work. I find an angled approach in the vice works best to avoid the raised surfaces on the Stock Retaining Pin. Apply heat to the Stock Retaining Nut and unscrew it from the Stock Retaining Pin.

 

IMG_0332_zpsnckwkyly.jpg

 

At this point, your Stock Retaining Pin free to be cleaned up with a wire brush to remove all of the factory thread locker.

Edited by StrangerDanger

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IMG_0309_zpscecpjdcc.jpg

 

Here is a photo showing the sling mount assembly overlaid on the stock.

 

Now for reassembly, most of the reverse installation is pretty self-explanatory. There is one area that can cause grief though. You need to screw the Stock Retaining Pin in through the assembly and into the Stock Retaining Piece. The problem is, there is nothing to hold the Stock Retaining Pin by as you thread it in deep inside of the stock. This is how I do it. I have two of the Stock Retaining Nuts on hand. I screw the first Stock Retaining Nut onto the Stock Retaining Pin as shown below.

 

IMG_0328_zpsh2wfcyyb.jpg

 

You want to gently screw the Stock Retaining Pin into the Stock Retaining Piece with the aid of the Stock Retaining Nut and your 13mm deep socket driver. You don’t want to crank on this, because you’re going to need to get that nut back off. Once you’ve seated the Stock Retaining Pin all the way, install the second Stock Retaining Nut onto the recoil pad side of the Stock Retaining Pin. Tighten this nut firmly in place. At this point, you should be able to unscrew the first Stock Retaining Nut without risk of the Stock Retaining Pin moving.

 

I would apply Locktite primer and blue Locktite to the threaded portion of the Stock Retaining Pin that the Stock Retaining Piece and permanent Stock Retaining Nut attach to. Do not put Locktite on the portion that screw into the receiver extension.

The Stock Retaining Pin is 8mm in diameter x 1mm thread pitch. A nylon lock nut is ideal for using as a slave nut.

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I started working on this before Benelliwerkes was nice enough to post his tutorial from his manual. Anyone notice I got a new camera? Eyephone 6S takes decent pictures!

Edited by StrangerDanger

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....You don’t want to crank on this, because you’re going to need to get that nut back off. Once you’ve seated the Stock Retaining Pin all the way, install the second Stock Retaining Nut onto the recoil pad side of the Stock Retaining Pin. Tighten this nut firmly in place. At this point, you should be able to unscrew the first Stock Retaining Nut without risk of the Stock Retaining Pin moving.

 

 

Once the stock retaining nut is secured to compress the springs against the threaded stock retaining plate, the threaded bolt cannot turn anymore as in order for it to happen, the stock retaining nut would have to be ripped off the other end of the bolt; it is this configuration that allows the slave nut to be unscrewed without fear of the bolt turning during the process.

 

Same principle as using a double-fisherman's knot to secure to mountaineering ropes together; opposing knots cannot pull thru each other.

 

Photo by permission: Anatomy Series Manuals

Screen%20Shot%202015-12-14%20at%205.41.35%20AM_zpsiqc016eb.png

Edited by benelliwerkes

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Thank you for the instructions and pics Stranger. Other sites said the plate was welded to the bolt and not to try it or you will damage the stock. I followed your directions and it was very easy. Hats off to you sir :)

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