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That part for the gas system is called the intensifier ring, and is only meant to be used when shooting the lighter loads, even though forgetfulness is sometimes to be expected.
The intensifier reduces the expansion room inside the gas cylinder so the pressure has a more direct impingement against the seals/o-ring.
Now can I remind the hockeybum to take a look in the owner's manual to see the description, if he happened to have it included with the purchase. Naturally, the manual is available somewhere on the Remington site, so check there if necessary.
Since there is discussion of oversized guns mainly being used for lighter loads, maybe this thread that gathered a lot of steam is relevant.
http://www.thehighroad.org/showthread.php?t=246219
This one also contains a link to the Browning chart that lists performance variance in patterns with shorter shells in longer chambers.
http://www.thehighroad.org/showthread.php?t=320928
http://www.browning.com/faq/detail.asp?ID=102
If you are interested in seeing the newest gunsmith website (mine), see the first postings there.
http://theshotgunshop.net/index.html
The site is so new that it is no use trying to use your searchbar. Type the address into your browser or click the link.
The embedded links have one listed as
article selection
that contains links to informative writings of mine.
Let me know if you have any comments to
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