I had my hands on a Mossberg 590S.
What's different is that it will handle 1.75" up to 3" without any adapter. From a machinist perspective I noticed a redesigned lifter and bolt carrier are the heart of the change. The carrier is machine to account for a longer tongue on the lifter. There is a hard bumper to the back. I think it is to soften the magazine shoot out of the 1.75" shells since they are lighter to keep them from bouncing up. A better bumper came out on the OSP 2 Mini Clip for similar reasons and to accomodate 1.75" to 2."
This got me to thinking on what can be done to a current 500 action. Also to keep me from buying one. I have Mossberg lifters as well as carriers parts laying around. Machining the carrier slot would not affect it from being used in any Mossberg. The lifter is another thing. This will be my winter project as I have a lot of parts to put together an 8 + 1 590 as well as the factory heat shield.
I recommend checking out some of the reviews on the 590S. I can't wait for TFBtv does one like the Mossberg 88
James Reeves can come off a bit obnoxious, but I see it as more funny than serious.
Also, the 590S was not for sale, unless you had $1200. Retail is supposed to be $750
Maloy
What's different is that it will handle 1.75" up to 3" without any adapter. From a machinist perspective I noticed a redesigned lifter and bolt carrier are the heart of the change. The carrier is machine to account for a longer tongue on the lifter. There is a hard bumper to the back. I think it is to soften the magazine shoot out of the 1.75" shells since they are lighter to keep them from bouncing up. A better bumper came out on the OSP 2 Mini Clip for similar reasons and to accomodate 1.75" to 2."
This got me to thinking on what can be done to a current 500 action. Also to keep me from buying one. I have Mossberg lifters as well as carriers parts laying around. Machining the carrier slot would not affect it from being used in any Mossberg. The lifter is another thing. This will be my winter project as I have a lot of parts to put together an 8 + 1 590 as well as the factory heat shield.
I recommend checking out some of the reviews on the 590S. I can't wait for TFBtv does one like the Mossberg 88
Also, the 590S was not for sale, unless you had $1200. Retail is supposed to be $750
Maloy