Jelly head maximum ?

[3" 870 Shell Shucker]

Do the O rings serve a purpose other than looking "cool?"

High visibility, to help you find the end of your barrel at first or last light?

[owlhoot]

harmonic barrel balancing, pattern tightening, zombie green o rings.

HOW MUCH FOR THE REPLACEMENT O- RINGS   

[FullChoke]

Do the O rings serve a purpose other than looking "cool?"

Reduces recoil.

I recoiled from it when I saw it, so it increases recoil? 

[chatterbox]

Do the O rings serve a purpose other than looking "cool?"

Reduces recoil.

I recoiled from it when I saw it, so it increases recoil? 

I don't care who you are, that's funny!

[JuniorPre 360]

Do the O rings serve a purpose other than looking "cool?"

Reduces recoil.

I recoiled from it when I saw it, so it increases recoil? 

Way too funny.