Remington Model 4, 742, 7400 disassembly notes –

Remington Model 4, 742, 7400 disassembly notes –

Big game hunters in the United States traditionally had two options in semi-automatic rifles, the Browning BAR and Remington 7400. While I’m not particularly fond of either, they both offer shooters quick follow up shots and reduced recoil over traditional bolt action designs. In this post we’ll take a quick look at the 7400 and how it is disassembled for maintenance.

We have a lots of older Remington semiautomatic rifles walk into the shop in need of repair. Unlike modern semi-automatic rifle designs, the Model 4, 742, and 7400 rifles that are extremely difficult to take apart. Basic maintenance, including detailed cleaning or recoil spring replacement, requires disassembly.

For reference purposes, a schematic of the 7400 can be found here.

In this post, let’s take a look at some tips on how I disassemble these rifles.

The contents of are produced for informational purposes only and should be performed by competent gunsmiths only. and its authors, do not assume any responsibility, directly or indirectly for the safety of the readers attempting to follow any instructions or perform any of the tasks shown, or the use or misuse of any information contained herein, on this website.

Any modifications made to a firearm should be made by a licensed gunsmith. Failure to do so may void warranties and result in an unsafe firearm and may cause injury or death.

Modifications to a firearm may result in personal injury or death, cause the firearm to not function properly, or malfunction, and cause the firearm to become unsafe.

After the rifle is safe and empty, I remove the screw located on the front of the forearm.

With the screw removed, the front end can slide off.

Removal of the fore end exposes the gas block. The gas block retained the action parts with a roll pin. The roll pin needs to be drifted out of a roll pin punch.

Once the roll pin is removed, the recoil system and spring can be removed.

Since the gas port is hard to access, most rifles we take apart need this area cleaned.

Next the barrel nut need to be removed. This is located in front of the receiver and is simply unscrewed with an open end wrench.

To remove the bolt assembly, the charging handle needs to be removed. removal of the handle is fairly difficult. A pin retains the handle. You can see it in the center of the picture above. This pin passes through the bolt carrier at an angle.

From the top of the rifle you can see the other side of the charging handle retaining pin.

To remove the pin I drift it from the top down with a pin punch.

Once the pin is drifted free, the charging handle can be removed and rifle can be taken apart further. To disassemble the bolt and carrier, the firing pin retaining pin needs to be drifted out. I only complete this task if necessary.

Often on these rifles the plastic ejection port cover needs to be replaced. In this image you can see the old one (above, right), next to the new part (above, left). Since the part is fairly inexpensive, I’ll often change it out once the gun is apart.

Once the gun is apart, I make sure to clean it well prior to reassembly. If you don’t work on these rifles regularly, it might be a better idea to have you local gunsmith handle repairs. When he tells you they are difficult to work on, believe him, they are!

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