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View Full Version : Remington 870 18.5" BBL 7+1 Capacity Shotgun


MAX100
06-08-2008, 3:00 AM
Most don't realize that a 870 with a 18.5" barrel has a 7+1 capability with the right tube extension while still using the extra long factory spring and factory follower. The mag tube still has little room to spare when loaded with 7 shells. I custom fitted one of my tube extensions to be even with the muzzle. The round count in the 870 18.5" barrel shotguns are limited by the factory tube extension design. The same tube extension can be fitted for the 21" barrel shotguns giving them 8+1 capacity. This extension will also work on a 11-87 and the 1100. The tube extension on the 11-87P extends past the barrel 1/2" and you only get 6+1 capacity. Why not have a tube extension that extends past the barrel the same length but gives you 7+1 capacity or one that is even with the muzzle.

I make these 7+1 tube extensions if anyone is interested.

Other after market tube ext are about 6 1/8" long and 5/8" to short on a 18.5" bbl 870 and only allows 6+1 capacity. My tube ext is 6 3/4" long even with the muzzle on a 18.5" bbl 870 and you get 7+1 capacity. Other after market tube ext are for the older 870's with a bbl length of 18". The extra 5/8" makes all the difference in the world giving an extra round capacity. I believe looks nicer also when the ext is even with the muzzle.

Here is a picture of the factory 870 extension showing why the round count is limited to 6+1 capacity. The indented ring and the narrow part of the tube end doesn't allow the follower to pass.

http://i267.photobucket.com/albums/ii299/MAX100/Rem870TEX-1.jpg


This is a New 870 Express HD 18.5" barrel with the new long fore end Model # 5077. It is nice looking shotgun. The pictures show the 870 Express 18.5" barrel fitted with a 7+1 capacity tube extension. I think that tube extensions look best when they are even with the muzzle. It gives the shotgun a nice squared up appearance. There is nothing like a nice custom fit. Some will say it needs a mag tube clamp and I say one can be installed if you feel the need, just not the factory one. This extension will not loosen because it has ridges cut in the base bottom that engages the dent ball on the locking lug. I like the looks of the new extended fore end. It has a semi auto look. The heat shield is a add on.


http://i267.photobucket.com/albums/ii299/MAX100/870HC-1.jpg



http://i267.photobucket.com/albums/ii299/MAX100/870HC-2.jpg



http://i267.photobucket.com/albums/ii299/MAX100/870HC-3.jpg




GC

UBFRAGD
06-08-2008, 7:04 AM
Nice looking 870!! This is one shotgun that looks good with a heat shield.

On one of my 870's, 28" barrel, I ran the 10-shot legal max mag tube and was dissapointed to find it fell one cartridge length short of the end of the barrel, but I still love her. I found that lots of shooting with heavy loads causes the mag extension clamp to walk around, after some trial and error I put another clamp on, now she can shoot all day without a tune-up.

BTW have you seen the clear mag tubes from I think DPMS?? Pretty crazy. They have one in 13-round capacity, does that mean you need to have a 32" barrel??

brassburnz
06-08-2008, 8:17 AM
Thanks for the pics and the info. Now I know why my factory extension tube stops 1 round shy of what I expected.

vinny_land
06-08-2008, 10:11 PM
Very slick looking 870.

twitch57
06-08-2008, 10:39 PM
pretty

though the pump is rather decieving

RedDawn
06-08-2008, 10:57 PM
Nice 870, kind of looks like an O/U, which I love by the way.

MAX100
06-08-2008, 10:58 PM
In the rack it looks like a semi auto. The long fore end and how it's styled looks good but it is probably not a good idea on a tactical shotgun. It would be good for someone with short arms.



GC

gg77
06-08-2008, 11:32 PM
Do you still need that barrel clamp? Would you be willing to sell it if you didn't need it anymore? :D

Synergy
06-09-2008, 12:06 AM
My Big 5 870 HD was 7+1, I also dont like the factory clamp. I ran 30 rounds without it and the tube loosened up. Your new tube is kinda vague. What did you build it or buy it?

MAX100
06-09-2008, 12:29 AM
My Big 5 870 HD was 7+1, I also dont like the factory clamp. I ran 30 rounds without it and the tube loosened up. Your new tube is kinda vague. What did you build it or buy it?

Your 870 has a 20" barrel and it probably is capable of 8+1 with the right tube ext. I know for sure the 21" bbl 870 is capable of 8+1. I pointed out why the factory tube ext causes the loss of one round. The one in the picture is 18.5" barrel 870 Express HD and has a 7+1 capacity with a little room to spare.

I custom made the tube in the pictures. I make tubes for:

Mossberg 500 Breacher +2
Moss 590A1 18.5" bbl +2
Moss 835 18.5" or 20" bbl
Norinco 982 870 copy or Pardner Protector +2
NEF Excell Auto 5
Now Remington 870 18.5" bbl +3 (7+1), 20" or 21" +4 (8+1)

The The Excell auto 5, Norinco 982 and the 870 take the same tube ext. I just have to take down the tube to length I need.

The Mossberg 590, 835, 935, 500 breacher, 500 MilsGun All take the same tube ext.


GC

BlackReef
06-09-2008, 12:30 AM
What heat shield is on that thing?

MAX100
06-09-2008, 1:11 AM
What heat shield is on that thing?

It is put out by John Masen and sold at Midway USA. It is a Winchester 1200 heat shield but it will fit many different guns. It only cost $15 and it is made of fiberglass resin. I like it better than a metal HS because it doesn't conduct heat like metal. It actually works. It is not a top quality shield but it is a good quality. It looks nice, works and it is low cost. The front brackets are made of fiber glass also and there are brass threaded inserts in the shield for the screws. It holds well because you can't rotate it by applying pressure. The back is not very secure but it stays down unless you pull up on it. It can be secured by a zip tie or a metal clip.



GC

aval64
06-09-2008, 1:24 PM
I really want that stock and forend, but cannot find it anywhere, do you know where it can be found?

MAX100
06-09-2008, 1:45 PM
I really want that stock and forend, but cannot find it anywhere, do you know where it can be found?


It is a Remington factory fore end and stock. That is the stock set they are now putting on some of the New Express HD models. You could call Remington. I like the way it looks also and it has a nice feel to it.

Some of the Express models in the past were not up to pare so I stop carrying them. Now, I have to say the new ones I just got in stock are top notch. The actions on all of them are pretty smooth.


GC

scewper
06-09-2008, 2:13 PM
The factory extension probably has that ring to limit the travel of the follower so it doesn't over-compress the spring. Couldn't the spring be damaged since it is so long? Just my guess. What do you guys think?

aval64
06-09-2008, 2:30 PM
Shot an email over to Remington regarding the stock and forend. If anyone has them, I would be glad to purchase the set...

MAX100
06-09-2008, 3:44 PM
The factory extension probably has that ring to limit the travel of the follower so it doesn't over-compress the spring. Couldn't the spring be damaged since it is so long? Just my guess. What do you guys think?

Look this is nothing new there are already other brand shotguns available with a 18.5" bbl that have a 7+1 rnd capacity. On those shotguns I don't see anyone looking to down grade the mag tube capacity to 6+1. The 870 is no different than those shotguns. They all have about 18.75" of space from the shell stop to the end of the mag tube.


The 590A1 is a military shotgun and it has a little less space left in the tube when fully loaded with 8 rounds than the 18.5" bbl 870 when it is fully loaded with 7.

The factory spring is high quality and very long. I don't believe it could be compressed enough to where it wouldn't feed reliably. If so, it would take a long time by keeping it fully loaded. If anyone is worried keep it loaded with 6 and you will have the option of 7 when it counts or when you are training.


GC

G-Man WC
06-09-2008, 7:10 PM
+1 - That thing gota Hemi in it? Sweet!

smle-man
06-09-2008, 9:16 PM
http://i238.photobucket.com/albums/ff237/smle-man/shotguns.jpg

I'd rather have the slightly shorter barrel and go with 6 round capacity. This 870 has the 18" barrel with the ST 2 round extention.

MAX100
06-09-2008, 11:12 PM
Both shotguns look good. I see your 870 has a true 18" bbl and Wilson tube ext on it. The new 870 shotguns now have a 18.5" barrel on them ,at least the ones I have measured with a dowel. They still say 18" bbl on the descriptions though.

Have you measured the bbl on your 11-87. It looks like it has a 18.5" barrel. If so, it could have a 7+1 capacity with one of my tube ext.



GC

trinydex
06-11-2008, 2:09 AM
The long fore end and how it's styled looks good but it is probably not a good idea on a tactical shotgun.

how come?

emrivera1
06-11-2008, 7:56 AM
Whats the OD on your mag extension? I'm wondering if it will fit barrel clamps.

MAX100
06-11-2008, 11:21 AM
how come?


This is what I was thinking when I wrote that. The long fore end on this Express completely covers the loading port when bolt is back. It will make it impossible to do the cruiser ready technique. When there are shells in the mag and a round in the chamber and you want to safe carry the shotgun with no round in the chamber but have a full mag. You stick your finger through the loading port and holding the next shell in the mag tube and pump the action to clear the round in the chamber for safe carry with a full magazine. This wouldn't be possible with the long fore end. It doesn't matter to me because I never do this technique anyway. Also a receiver mounted shell carrier would be out with this fore end.


emrivera1 Whats the OD on your mag extension? I'm wondering if it will fit barrel clamps.


My +3 (7+1) mag extension for a 18.5" bbl 870 has a 1" diameter tube just like any other 870 tube ext. An after market mag tube clamp would be no problem.

Other after market tube ext are about 6 1/8" long and 5/8" to short on a 18.5" bbl 870 and only allows 6+1 capacity. My tube ext is 6 3/4" long even with the muzzle on a 18.5" bbl and you get 7+1 capacity. Other after market tube ext are for the older 870's with a bbl length of 18". The extra 5/8" makes all the difference in the world giving an extra round capacity. It looks nicer also when the ext is even with the muzzle in my opinion.



GC

trinydex
06-11-2008, 12:34 PM
oooh thanks for the tip, i never thought of that. now i don't have to unload my entire mag. i feel really stupid.

emrivera1
06-11-2008, 5:07 PM
My +3 (7+1) mag extension for a 18.5" bbl 870 has a 1" diameter tube just like any other 870 tube ext. An after market mag tube clamp would be no problem.GC

Great thanks! One more question, do you have any better pics of the front of it? I'm just curious. BTW, this is kraaazymike, with whom you spoke with the other day. One normally asks these questions before purchasing right? Anyway, can't wait to try it out!

MAX100
06-11-2008, 5:25 PM
Great thanks! One more question, do you have any better pics of the front of it? I'm just curious. BTW, this is kraaazymike, with whom you spoke with the other day. One normally asks these questions before purchasing right? Anyway, can't wait to try it out!

It has a hard plastic rubber stopper in the end. The rest of the tube is a fixed one piece tube made of all steel. I sent your tube ext out today. You should have it by Sat. You will be able to see it for yourself in person. Try it out and let me know. You will be pleased. I make the same type extension for other shotguns also and I never had anyone say they were not pleased with theirs.

Here is a picture of one of my +2 extension on Mossberg 590A1 18.5" BBL.

http://i267.photobucket.com/albums/ii299/MAX100/590A1-3-1.jpg




GC

emrivera1
06-11-2008, 5:45 PM
It has a hard plastic rubber stopper in the end. The rest of the tube is a fixed one piece tube made of all steel.

Any long term effects of heat and abuse to the stopper? Curious on the likelihood of it failing and ease of replacement in case.

MAX100
06-11-2008, 8:01 PM
What heat? I have never seen or heard of a tube extension that gets that hot. Think about plastic microwave bowls.

Choate uses the same type of stopper in their tubes and have for years. Mine is a little different style though.

Like I said if you don't like it send it back someone else will be glad to have it with a little price break.


GC

emrivera1
06-11-2008, 8:17 PM
What heat? I have never seen or heard of a tube extension that gets that hot. Think about plastic microwave bowls.

Choate uses the same type of stopper in their tubes and have for years. Mine is a little different style though.

Like I said if you don't like it send it back someone else will be glad to have it with a little price break.


GC

I was just curious was all. And I have no doubts it'll be as great as I keep hearing. I know you keep mentioning I can return it, but I highly doubt I will.