AR15.Com Archives
 Remington 870 Trigger Plate Differences
countryboy52590  [Member]
1/22/2012 2:23:02 PM EST
I have an older style Remington 870 Wingmaster which I need a new trigger plate assembly for. The safety button is hanging up on the old trigger plate assembly because the detent channel is worn out. I've got a thread posted in the EE section looking for one but I have a few questions.

Since this is an older model 870 Wingmaster with a 2 3/4" reciever can I use a trigger plate assembly from a newer 870 perhaps with a 3" reciever? Or will the shell feed lever on the trigger plate assembly be too long for the 2 3/4" reciever?

Basically I just need to know if theres a reason as to why an 870 Express trigger plate assembly will or will not work in my standard 2 3/4" Wingmaster reciever.

Thanks for any help guys!
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dfariswheel  [Member]
1/22/2012 3:21:30 PM EST
All 12 gauge 870 trigger groups are the same, with the possible exception of the 3 1/2" Super Magnum, and I'm just not sure about that.

The only difference between a 2 3/4" gun and a 3" gun is that the 3" gun has a longer ejector in the receiver and an "M" at the end of the serial number.
Remington and people like Wilson can easily convert a 2 3/4" gun by installing a 3" ejector and refinishing the receiver.

In other words, any 12 gauge 870 trigger group will work.
countryboy52590  [Member]
1/22/2012 6:45:05 PM EST
So what they'd do to change it is open the ejection port up to size for ejecting spent 3" shells?

Thanks for the info on the trigger plates btw.
Dano523  [Team Member]
1/23/2012 7:31:27 AM EST
Your throwing the baby out with the bath water by replacing the trigger housing.

Pull the ball bearing, the spring, and the rod, then go down to a local gun smith and get the next size up ball and a piece of pin stock the same size as the slightly larger ball bearing.

Now drill out the channel for the new ball bearing size, use the same spring, make the new detent out of the new piece of rod stock, and then use the old cross pin to hold everything back in.

Grant total price for the repair, probably nothing since the smith may just give you the ball bearing and short piece of rod stock for free.
BigWok  [Member]
1/23/2012 11:54:39 AM EST
Originally Posted By Dano523:
Your throwing the baby out with the bath water by replacing the trigger housing.

Pull the ball bearing, the spring, and the rod, then go down to a local gun smith and get the next size up ball and a piece of pin stock the same size as the slightly larger ball bearing.

Now drill out the channel for the new ball bearing size, use the same spring, make the new detent out of the new piece of rod stock, and then use the old cross pin to hold everything back in.

Grant total price for the repair, probably nothing since the smith may just give you the ball bearing and short piece of rod stock for free.


There is ONLY a ball bearing, a spring, and a pin that holds them in place. No "rod". To the OP yes all trigger groups will fit even the plastic ones with the lockable saftey. The only difference between a 2 3/4" and 3" reciever is the ejector NOT the ejection port. What exactly is worn out about the channel that holds the safety ball detent??
countryboy52590  [Member]
1/23/2012 12:29:42 PM EST
Originally Posted By BigWok: What exactly is worn out about the channel that holds the safety ball detent??


The channel it's self, somehow the side of the channel is worn slap out and the detent just rattles around in there. I'll try and get some pictures to post. I've already thought about fixing it but theres no way to do it unless I fill the entire channel with JB weld or something and drill everything back out to proper specs. Overall it would be a whole lot easier to just replace the trigger plate assembly than repair the current one.
86HMMWV  [Team Member]
1/23/2012 1:53:19 PM EST
If it matters to you, a new Express trigger group will have a polymer trigger guard, while the trigger guard on your old Wingmaster is metal. There's no downside to that other than it won't be original.
countryboy52590  [Member]
1/23/2012 2:44:50 PM EST
Originally Posted By 86HMMWV:
If it matters to you, a new Express trigger group will have a polymer trigger guard, while the trigger guard on your old Wingmaster is metal. There's no downside to that other than it won't be original.


It doesnt really matter. The shotgun is very old and well used and has little to no blueing left on it and I plan to refinish it with Brownell's Aluma-Hyde II in matte black so then a polymer trigger guard would probably match up nicer than having to chance it by seeing if I could refinish the aluminum trigger guard on the gun right now with the Aluma-Hyde II.

dfariswheel  [Member]
1/23/2012 7:20:18 PM EST
Originally Posted By countryboy52590:
So what they'd do to change it is open the ejection port up to size for ejecting spent 3" shells?

Thanks for the info on the trigger plates btw.


No, the ejection port is the same size on the 2 3/4" and 3" guns. It's bigger on the 3 1/2" Super Magnum.
Again, the ONLY difference between a 2 3/4" gun and a 3" gun is the ejector in the receiver wall and the "M" in the serial number.
Everything else is the same.

The polymer trigger guard unit has proved to be as strong and as good as the powdered compressed aluminum guard.
(The aluminum guard is compressed powdered aluminum. That doesn't sound as good as "aluminum" does it).

The advantages of the polymer unit is that there's no finish to wear off. The guard will flex and return to shape if struck, the aluminum usually just breaks. It's self lubricating, and has stood up just as well as the powdered aluminum unit.
Also, no one seems to have problems with polymer pistols, but think the polymer 870 unit is junk just on general principles.

Having had some fun with you, while the polymer unit is just as good, I still want the original powdered aluminum unit on my guns.
countryboy52590  [Member]
1/23/2012 8:23:49 PM EST
Ah I see. So if i wanted to convert a non-magnum Wingmaster to magnum capabilities I would need a smith to install a magnum ejector in the reciever.

And that's quite interesting about the aluminum trigger plate assemblies, I never knew they were constructed of powdered compressed aluminum.

I'm going to be purchasing a polymer unit from a fellow arfcommer in the EE section for the shotgun, I think I'll be well pleased with it. It does however come with the locking safety button and the key,.I'm thinking I can probably just swap the safety button out with the one from my current trigger plate assembly and not have to worry with the key lock unit, correct?
BigWok  [Member]
1/24/2012 6:34:07 AM EST
Originally Posted By countryboy52590:
.I'm thinking I can probably just swap the safety button out with the one from my current trigger plate assembly and not have to worry with the key lock unit, correct?


Yes you can swap the safety over but you will have to swap all the parts. i.e. safety button, ball detent, spring. as the locking safety has a different style detent and possibly different spring (shorter). I would also recommend you swap out the safety button with Vang Comp or S&J Hardware oversized button. These are much better I prefer the S&J but they are both pretty much the same thing. Hope this helps.
countryboy52590  [Member]
1/24/2012 3:37:31 PM EST
Originally Posted By BigWok:
Originally Posted By countryboy52590:
.I'm thinking I can probably just swap the safety button out with the one from my current trigger plate assembly and not have to worry with the key lock unit, correct?


Yes you can swap the safety over but you will have to swap all the parts. i.e. safety button, ball detent, spring. as the locking safety has a different style detent and possibly different spring (shorter). I would also recommend you swap out the safety button with Vang Comp or S&J Hardware oversized button. These are much better I prefer the S&J but they are both pretty much the same thing. Hope this helps.


Thanks for the tips BigWok! I'll look into those parts and I'll tinker around with the safety assembly and see what I can do, if I cant change it out it doesnt really matter to me. I'll just leave it unlocked most of the time unless the shotgun is in storage.
countryboy52590  [Member]
1/24/2012 3:54:50 PM EST
Originally Posted By BigWok:
Originally Posted By Dano523:
Your throwing the baby out with the bath water by replacing the trigger housing.

Pull the ball bearing, the spring, and the rod, then go down to a local gun smith and get the next size up ball and a piece of pin stock the same size as the slightly larger ball bearing.

Now drill out the channel for the new ball bearing size, use the same spring, make the new detent out of the new piece of rod stock, and then use the old cross pin to hold everything back in.

Grant total price for the repair, probably nothing since the smith may just give you the ball bearing and short piece of rod stock for free.


There is ONLY a ball bearing, a spring, and a pin that holds them in place. No "rod". To the OP yes all trigger groups will fit even the plastic ones with the lockable saftey. The only difference between a 2 3/4" and 3" reciever is the ejector NOT the ejection port. What exactly is worn out about the channel that holds the safety ball detent??


There is actually a rod in the safety assembly in my other 870, it's a little older than the one I need the replacement part for though. Just took it apart and there was the pin that retains the assembly, a spring under it, a rod under the spring, and a ball detent under the rod, then the safety button.
BigWok  [Member]
1/24/2012 4:29:04 PM EST
Good info I stand corrected. I just got done replacing 5 safety buttons with oversized buttons. So I was pretty sure about that. Wonder when they made the change?? I'll have to pull apart my older Wingmaster TB and check it out. Your trigger group looks fucked, I'm sure you/ll be happy with the new one. Keep us posted, and how bout a pic of the whole gun? Cause everybody loves 870 porn.
countryboy52590  [Member]
1/24/2012 4:33:07 PM EST
I was surprised to find that myself, I haven't seen anything like it until now. Never really taken this trigger plate assembly apart. I suppose we live and we learn... right? LOL.

But yeah that TPA has just about had it, I believe I'm gonna be really happy with the new polymer assembly.
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