First off - thanks for all the replies!
The recoil "pad" of my 12ga is about 1/4"-thick, hard plastic. Not much "pad" to it. The other is actually my wife's gun and I haven't looked too closely at it.
I'll look at the Midway video (esp. since TWO people suggested it right off the bat) and see if it's something I feel confident doing.
Personally, I'd like to find someone who could measure my LOP and let me know what would be optimum. I have rifles that I can shoot with no issues, but the only shotgun that "feels" right has a 6-position, collapsible stock.
The strongest reason for the people to retain the right to keep and bear arms is, as a last resort, to protect themselves against tyranny in government. - Thomas Jefferson
When the people fear their government, there is tyranny; when the government fears the people, there is liberty. - Thomas Jefferson