No argument on the 68X Beretta 28 gauge, especially if he can source a smaller baby frame model. and that is really what he wants. Even the Beretta 28 gauge made up on the 20 gauge frame size are not "heavy" guns.
Can that be done for $1K? (the OP's desired budget). Now that's going to be tough I'd say.
28 gauge O/Us and doubles are pretty popular right now. Even the older 68X series guns have not lost much value as the new prices continued to climb and recent ones are rarely less than $1800. I got closer to $1K at around $1200 for a 1992 S686 Beretta, and the stock had some blemishes. I cannot recall one selling for $1K recently. Yes mine had the rounded fore end not the Schnabel fore end.
The mid grade FAIR guns and and the Franchi Instinct L in 28 gauge are more in the $1350 to $1700 range I believe. I don't own one but I cannot say that I have heard a lot of negatives, except for the automatic safety on the Franchi Instinct occasionally slipping and preventing a 2nd shot. A fair number of folks had the auto safety feature removed or disabled.
The cheapest solution is definitely the Franchi AL48 in 28 gauge if he wants a field semiauto. Usually less than 6 lbs in weight and occasionally available pretty cheap ($500 and less). Long recoil system like the Browning A5.
Re the Ruger Red Label 20 gauge his Dad borrowed -- I just never loved this 20 gauge model because it weighed what most 12 gauge field guns weighed. Most of the Ruger 20s that I have handled weighed 7 pounds.
https://www.shotgunworld.com/bbs/viewto ... =2&t=28972 For clays, I suppose that weight might be okay and it is well built. And 20 gauge ammo is much cheaper and with more available load choices than 28 gauge. I recognize many folks love the Red Labels --- but I was not among them. The comparable Italians O/U s felt so much better balanced and livelier as field guns, at least to me. Hell my Beretta 12 gauge S686 with 26 inch tubes only weighs 6 lbs 10 oz. Why would I carry a 20 gauge field gun that weighs as much or more as a 12 gauge?