At one time I owned the first one that was sold in BC, shot it extensively for several years. Yes, the adjustable rib is sprung and it makes a ‘sproing’ noise when the gun fires that you might hear even with the noise of the shot, or maybe you partly feel it. Anyway, I noticed it but I quickly got used to it. It seems to be quite sturdy if you don’t constantly fiddle with it, never had any problem with mine. And yes, the recoil reducer does click when compressed. It works well and is adjustable for degree of reduction as well as the pad being fully adjustable for length, drop and cast. And of course the comb is fully adjustable as well and this is the only problem area that I have seen on these guns.
Because the comb adjustment is by means of loosening and tightening opposing set screws this system can get sloppy over time if changed too often, then one or more screws won’t properly be secured. These set screws seat onto brass which is soft and will deform if the set screws are cinched down too often and too tightly. My observation of other owners is that if you adjust, adjust, adjust the comb ( and some people just seem to be always fiddling) you will eventually have problems but if you fit the gun as best you can at home by setting the set screws lightly each time you adjust and then shoot for results and make changes sparingly based on several outings involving averaging hundreds of rounds rather than adjusting after a round or two the system works great. The idea is to fit the gun to you personally and once it’s good shoot it lots and try to pick up an extra bird or two by repetition not by more adjustment.
These guns were revolutionary when introduced and thousands of them are still smoking clays all over North America by satisfied owners, they were basically a full custom fully adjustable clay breaking machine right out of the box from a major manufacturer, previously a gun with all or even some of these features was only available by adding these features to a basic gun, usually at a cost more than the new basic gun itself. These guns are treasured by their owners and hard to find for sale.