I always thought that the sliding breech design was conceived to remove the likelihood of poor barrel lock up and therefore miss alignment issues. For my own average skills however, I have never noticed any difference in accuracy between say a well fettled 77 or an 80. Both are equally as capable, and with the solid engineering skills and design of the originators ( and further modifications of various tuning houses) in my own hands its all about the internal dimensions of the piston/stroke rather than how the barrel/cocking happens to occur. The new Walthers guts appears to resemble the internal dimensions of my own 80 Lazahunter that was made in 2004. Very coincidental?

Andy