Gunsmithing 870 SBS Help.

LoneWolfUSMC

LoneWolfUSMC

Lt. Colonel
Full Member
Minuteman
Jan 9, 2008
7,363
18
Southern Indiana
www.8541tactical.com
#1
For anyone who works with Remington 870's....

I was just issued a 14" (guessing, I haven't actually measured it yet) Remington 870. It was a arms room hack job, and I have a sneaking suspicion that the barrel was cut down with a pipe cutter. I am not sure if it was done by one of our guys or if it was siezed in that condition. The barrel WAS a Remington improved cylinder. I have not shot it yet. In order to carry it I will have to qualify at 15 yards with 00 buckshot and out to 50 yards with slugs.

If this thing patterns like crap (which it may), is there any way to install a choke in the barrel? It needs to shoot both buck and slugs because I really don't want to carry it and my 18" 870. The trunk is getting a little crowded.

Thanks
 
#2
Re: 870 SBS Help.

im sure someone can clean the end up, and thread the inside and get a choke in it. is the end messed up like rough. it should be fine for what your gonna do with it.
 
#3
Re: 870 SBS Help.

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: LoneWolfUSMC</div><div class="ubbcode-body">For anyone who works with Remington 870's....

I was just issued a 14" (guessing, I haven't actually measured it yet) Remington 870. It was a arms room hack job, and I have a sneaking suspicion that the barrel was cut down with a pipe cutter. I am not sure if it was done by one of our guys or if it was siezed in that condition. The barrel WAS a Remington improved cylinder. I have not shot it yet. In order to carry it I will have to qualify at 15 yards with 00 buckshot and out to 50 yards with slugs.

If this thing patterns like crap (which it may), is there any way to install a choke in the barrel? It needs to shoot both buck and slugs because I really don't want to carry it and my 18" 870. The trunk is getting a little crowded.

Thanks </div></div>

LoneWolf,

Take a look at the shotguns for LE/Military on my website (www.undergroundsw.com). I build SBS packages that includes threading for chokes and I do full sight/rail packages as well. The sights, rails, mag tube extension/mag cap, follower, big head safety are all manufactured in-house. My 14" SBS with barrel mods and full choke will pattern OO Hornady TAP (Blue Hull) into just over an inch at 15 yards. Take a look and let me know if you have any questions....
 
#4
Re: 870 SBS Help.

Skunk, PM Sent.

BTW, this is badass:

Standoff.jpg
 
#8
Re: 870 SBS Help.

Hmm...looking at your site, Mike. Stuff looks great! Thinking I should send you my old 700PSS for a makeover.
 
#9
Re: 870 SBS Help.

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Dogtown</div><div class="ubbcode-body">Hmm...looking at your site, Mike. Stuff looks great! Thinking I should send you my old 700PSS for a makeover. </div></div>

Thanks....I'd be up for that....Just shoot me an e-mail or call anytime....
 
#11
Re: 870 SBS Help.

LoneWolfUSMC,

Another option instead of chokes is to "backbore" or "freebore" the barrel from the chamber forward and leave the last 2-4" of barrel factory diameter. Factory barrels have a few inches of this to begin with. This "creates" a choke in the last few inches of the barrel that won't deform shot like a constricting choke can. This is basically what Vang Comp barrels do.

Darin Reiss
FFL/SOT in Haysville, KS
 
#12
Re: 870 SBS Help.

Skunkworks,

Your "skunkworked" Remington action ROCKS@! I don't believe I have even seen a 700 with a pre 70 Winnie style extractor. Combined with the 3 position safety is pretty cool.

Darin
 
#13
Re: 870 SBS Help.

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: DarinR</div><div class="ubbcode-body">LoneWolfUSMC,

Another option instead of chokes is to "backbore" or "freebore" the barrel from the chamber forward and leave the last 2-4" of barrel factory diameter. Factory barrels have a few inches of this to begin with. This "creates" a choke in the last few inches of the barrel that won't deform shot like a constricting choke can. This is basically what Vang Comp barrels do.

Darin Reiss
FFL/SOT in Haysville, KS </div></div>

This is a very true statement but I've found that the only 870 barrels worth backboring are the 870P barrels. The 870 cylinder bore barrels are too inconsistent (the bores) from one barrel to the next to get consistent results from backboring. So one cyl bore barrel may work great while the next five are not so good. The Skunkworks process for the cylinder bore barrels is to lengthen the forcing cone, work the bore over from the end of the cone to about three inches from the muzzle and thread for chokes. This allows consistent results 100% of the time out of a cyl bore barrel. The 870P barrels are higher quality (Improved cylinder) and respond extremely well to backboring and forcing cone work and pattern consistently from one "P" barrel to the next after backboring. Porting a shotgun barrel does absolutely nothing to reduce muzzle rise, so it's not offered as an option.
 
#14
Re: 870 SBS Help.

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: DarinR</div><div class="ubbcode-body">Skunkworks,

Your "skunkworked" Remington action ROCKS@! I don't believe I have even seen a 700 with a pre 70 Winnie style extractor. Combined with the 3 position safety is pretty cool.

Darin </div></div>

Thanks Darin. That rifle was a lot of fun to do and it shoots in the .1's. The typical SPR is built on the Skunkworks action and I'll be offering some really cool features on our action by the end of the year.
 
#15
Re: 870 SBS Help.

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Skunkworks</div><div class="ubbcode-body">
DarinR said:
This is a very true statement but I've found that the only 870 barrels worth backboring are the 870P barrels. The 870 cylinder bore barrels are too inconsistent (the bores) from one barrel to the next to get consistent results from backboring. So one cyl bore barrel may work great while the next five are not so good. The Skunkworks process for the cylinder bore barrels is to lengthen the forcing cone, work the bore over from the end of the cone to about three inches from the muzzle and thread for chokes. This allows consistent results 100% of the time out of a cyl bore barrel. The 870P barrels are higher quality (Improved cylinder) and respond extremely well to backboring and forcing cone work and pattern consistently from one "P" barrel to the next after backboring. Porting a shotgun barrel does absolutely nothing to reduce muzzle rise, so it's not offered as an option. </div></div>

Skunkworks,

Thanks for the info! I didn't realize there was that much difference in quality. I knew there was a reason I wanted an 870P for a project gun. I SBS'd a basic 870 about 11 years ago and it was performed ok but I just demo the gun and shoot an occasional blackbird with it.

Thanks,
Darin
Click to expand...
 
#16
Re: 870 SBS Help.

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Skunkworks</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: DarinR</div><div class="ubbcode-body">Skunkworks,

Your "skunkworked" Remington action ROCKS@! I don't believe I have even seen a 700 with a pre 70 Winnie style extractor. Combined with the 3 position safety is pretty cool.

Darin </div></div>

Thanks Darin. That rifle was a lot of fun to do and it shoots in the .1's. The typical SPR is built on the Skunkworks action and I'll be offering some really cool features on our action by the end of the year. </div></div>

I have been a Rem 700 fan since I was a kid and then a year or so ago I ordered in some FN SPR actions from CDNN for a customer. I ended up ordering a few for my self and had them built up into hunting rifles after seeing his. I really like the extractor system and 3 position safety that LOCKS the firing pin.

Darin
 
#17
Re: 870 SBS Help.

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: DarinR</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Skunkworks</div><div class="ubbcode-body">
DarinR said:
This is a very true statement but I've found that the only 870 barrels worth backboring are the 870P barrels. The 870 cylinder bore barrels are too inconsistent (the bores) from one barrel to the next to get consistent results from backboring. So one cyl bore barrel may work great while the next five are not so good. The Skunkworks process for the cylinder bore barrels is to lengthen the forcing cone, work the bore over from the end of the cone to about three inches from the muzzle and thread for chokes. This allows consistent results 100% of the time out of a cyl bore barrel. The 870P barrels are higher quality (Improved cylinder) and respond extremely well to backboring and forcing cone work and pattern consistently from one "P" barrel to the next after backboring. Porting a shotgun barrel does absolutely nothing to reduce muzzle rise, so it's not offered as an option. </div></div>

Skunkworks,

Thanks for the info! I didn't realize there was that much difference in quality. I knew there was a reason I wanted an 870P for a project gun. I SBS'd a basic 870 about 11 years ago and it was performed ok but I just demo the gun and shoot an occasional blackbird with it.

Thanks,
Darin </div></div>

The "P" gun is a great project gun....The receivers are the same but there are a few differences in comparison to the Express Magnum. The EM has a powdered steel extractor whereas the "P" gun extractor is machined. There are also two springs in the "P" gun trigger group that are different than the EM. I typically convert the EM trigger groups to "P" gun triggers. A few other small differences as well, but the most significant is the barrel.
Click to expand...
 
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