Frankly I'd rather shoot and do shoot an RBL than a Purdey.
I won't debate the reasons for my choice of an RBL over a Purdey but I also have a CSMC M21 and a CSMC Fox and have voted with my money rather than purchase someone else's idea of a quality firearm.
BTW you can't get a real M21 in the 'Baby' frame that CSMC produces. A Winchester branded M21 28 gauge will go over 7#'s, I have a CSMC 28 gauge M21 at 5# 13oz with steel heel and toe plates. Plain butt, that gun would be about 5# 10oz.-Dick