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View Full Version : converting 870 to three inch magnum ?


wonderdog451
May 27, 2012, 23:00
Is it true that to convert a Remington 870 that has a barrel originally chambered for 2 3/4" shells to fire 3" magnum all someone has to do is switch out the barrel? I was considering that as an upgrade ( even though firing a three inch shell is not that pleasant) but would like some additional input before I decide.:biggrin:

tdb59
May 27, 2012, 23:17
The ejector is in a different position on the Magnum receiver.

You can fire 3", but the empties may not clear the port reliably if you just change the barrel.

RPBII
May 28, 2012, 04:55
Do you have an "M" in the serial# on your receiver. If you do it is a magnum receiver.

ByronF
May 28, 2012, 05:06
tdb59 got it. With a 3" barrel installed it'll cycle unfired 3" shells all day long. But just try to eject fired hulls reliably.

Back in the 80's the 3" mags cost a significant premium over the 2-3/4" shotguns. Dimensionally the only difference is an ejector that is set back further from the chamber. Maybe heat treat or material was different but I doubt it.

wonderdog451
May 28, 2012, 17:59
I did some more research and it seems that Wilson Combat is offering an upgrade for Remington 870 shotguns where not only do they rebuild and refinish them, but convert them to be able to fire 3" magnum shells as well. Now, correct me if I am wrong, but three inch magnum shells were originally developed as a way to improve hunting loads by increasing the payload and have limited use as a self- defense option. http://wilsoncombat.com/new/shotgun-remington-steal.asp

tdb59
May 28, 2012, 18:04
.... Now, correct me if I am wrong, but three inch magnum shells were originally developed as a way to improve hunting loads by increasing the payload and have limited use as a self- defense option.

No disagreement with that statement.

GW870
May 28, 2012, 18:55
No argument there 'dog. Guts have been exposed by 2 3/4 in
humans and animals for many, many years!

GW

kotengu
May 28, 2012, 18:55
No disagreement with that statement.

X2. If 2 3/4" doesn't do it, 3" won't do it either.

tdb59
May 28, 2012, 19:05
X2. If 2 3/4" doesn't do it, 3" won't do it either.

Yep, the caveat being that ' low recoil ' [WTF ! ] may not do it !

Ya gotta HIT 'em hard, then HIT 'em again.

Misses keep lawyers in business.