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I've done a few upgrades to a couple of my shotguns recently, and since I couldn't find any good instructions/pictures/tutorials online, I thought I'd do a few of my own. Maybe the next guy who is looking for some installation info will find this helpful.
This, the first tutorial, will cover how to install a Wide Action Release from Tank's Rifle Shop in a 12ga Remington 870.
What you get:
The Wide Action Release currently costs $33.40 directly from Tank's. You will also need to order a replacement hammer pin for your trigger group. Hammer pins are also available from Tank's for $3.00, but you will have to make sure you get the one appropriate for your trigger housing as the metal housing and plastic housing require different hammer pins.
What it does:
Some people will claim that the Wide Action Release is an answer in search of a problem, but anyone who operates their shotgun in a stressful environment (or with gloved hands) will appreciate the larger surface area of the Tank's release. It is definitely hard to miss as it increases the surface area of the standard release by three times.
I couldn't determine how the release was modified, but it actually looks to be a Remington factory release with material added. It's hard to tell if it is metal or some sort of polymer, but it feels very solid.
Getting started:
I forgot to take pictures of how to remove the two pins that retain the trigger group in a Remington 870 but, honestly, if you can't figure that out on your own, you probably shouldn't be attempting this modification by yourself.
Once the trigger group is out, the first step is going to be grinding out the staked end of the stock hammer pin (A).
Just grind down far enough to remove the staking of the pin.
The next step is to drive the hammer pin out, remove the shell carrier (You can do this before grinding the hammer pin as well) and disassemble what we can. Pay special attention to the hammer spring and plunger (A) and the carrier spring and plunger (B) as they can go flying when you start removing other parts (Ask me how I know).
Note: The hammer spring and plunger are captured by a tab on the action release. Also note how the bent wire spring is oriented UNDER the action release.
Once you've got it apart, you should end up with something like this...
This, the first tutorial, will cover how to install a Wide Action Release from Tank's Rifle Shop in a 12ga Remington 870.
What you get:
The Wide Action Release currently costs $33.40 directly from Tank's. You will also need to order a replacement hammer pin for your trigger group. Hammer pins are also available from Tank's for $3.00, but you will have to make sure you get the one appropriate for your trigger housing as the metal housing and plastic housing require different hammer pins.

What it does:
Some people will claim that the Wide Action Release is an answer in search of a problem, but anyone who operates their shotgun in a stressful environment (or with gloved hands) will appreciate the larger surface area of the Tank's release. It is definitely hard to miss as it increases the surface area of the standard release by three times.
I couldn't determine how the release was modified, but it actually looks to be a Remington factory release with material added. It's hard to tell if it is metal or some sort of polymer, but it feels very solid.

Getting started:
I forgot to take pictures of how to remove the two pins that retain the trigger group in a Remington 870 but, honestly, if you can't figure that out on your own, you probably shouldn't be attempting this modification by yourself.
Once the trigger group is out, the first step is going to be grinding out the staked end of the stock hammer pin (A).

Just grind down far enough to remove the staking of the pin.

The next step is to drive the hammer pin out, remove the shell carrier (You can do this before grinding the hammer pin as well) and disassemble what we can. Pay special attention to the hammer spring and plunger (A) and the carrier spring and plunger (B) as they can go flying when you start removing other parts (Ask me how I know).
Note: The hammer spring and plunger are captured by a tab on the action release. Also note how the bent wire spring is oriented UNDER the action release.

Once you've got it apart, you should end up with something like this...
