Remington 870 Ejection Window Modification
I’ve heard about this Remington 870 modification several times. I was not sure about it because it requires modification of the ejection window and it cannot be undone. This is the most radical way to improve reliability of your Remington 870, so if you don’t have many issues with extraction you don’t need it.
WARNING! This modification cannot be undone. Make it only if you are 100% sure.
But as author of the Rem870.com blog I need to check everything about Remington 870 and see if it works.
This upgrade will not harm your shotgun. It functions properly, but only tests and several hundreds of rounds can tell if this upgrade is good.
Here you can see two Remington 870 receivers, one is standard, secone one is modified:
Start process with fixing Remington 870 receiver in vise:
Then, carefully measure how much metal you need to remove with Dremel to make front part of the ejection port rectangular:
Outch !!!! Can’t to that to my gun !!!! I prefer it as it is ……. even with a few shortcomings …. even though I have not noticed anything of that sort !!!!!
Besides, can’t understand what type of problem this modification would correct .. !!!!
Theodore, I was very worried about my gun too! But I did this for educational purposes.
Some say that rectangular form of the ejection window ensures more reliable extraction of fired shells.
Pretty extreme approach, but it seems like it might be most applicable on the 870 SuperMags. The 870 receiver was never designed to cycle those 3.5″ shells, and I’ve heard that the SuperMags won’t always eject them reliably.
The theory that I’ve heard is following: rounded edges doesn’t allow shell to be extracted as fast as possible, that is why Remington 887 and Mossberg shotguns have rectangular ejection windows.
Not sure if it’s true but I did this mod to see how it’s going to work.
На самом деле есть один нюанс: подобную опиловку надо делать с осторожностью.
Если передняя часть окна будет строго прямоугольной формы, гильзы будут выбрасываться не так энергично, вяленько.
“Печная труба”, от которой данный вид напиллинга помогает избавиться, случается, в основном:
1. на патронах с излишне закруглённой закраиной;
2. на морозе, когда жёсткость пластиковой гильзы значительно возрастает.
На приличных патронах при плюсовой температуре невыброс гильзы достаточно редок.
will this harm the shot gun. we had this model in the black sea in constanta, romania’.i am an albanian- italino, nat’l’.i served, in the american service.
No, it will not harm the shotgun. But this procedure is very radical and not required for most of the shotguns. I needed to test this modification to see if it works.
So, if your shotgun works properly, don’t do this.
У меня с этим улучшение оружие наработало уже несколько тысяч выстрелов – и наработает ещё столько же.
The part that you took out that came with the gun (later replaced ) was in back wards. That part when installed the opposite way can come out easy using a big rounded head nail with pliers. Hole the end of the nail. Insert head of nail thru the hole and pull part out . easy I have done it that way for yrs. Ohh The part comes out in seconds about two LOL
i have to do this to cure stovepipes
so after 4 years what do you think about that mod you made ?
I don’t think it was necessary. Choose good ammo, polish chamber and get good extractor, that should fix all of the problems.
i polish the chamber already
also i have a bore brush and give it some passes every time i clean it
yesterday i put the volquartsen extractor
and i filed a litle the port
then i shoot about 20 rounds hunting with no problems
but as you say it only happens with specific ammo
just a different brand /type of ammo not always more expensive
may work better