Not all "period" SLE Lancasters were wristbreakers. Even though externally all of the SLE's might have looked similar, some were not built as self openers, and some weren't equipped with ejectors.
The Wristbreaker was never hard to OPEN! Its not even that hard to close if you have the proper technique down.

Most 12 bore Wristbreaker aka Model A's wil be in the 6.5 to 6.12 range, never ever seen one that weighed in at 7 pounds. So "heavy", no not exactly.

And even though it creeps me out to no end when I agree with jOEy, he's right on the money regarding this pairs outrageous price tag.

Dustin