Beth, that gun did not appear to have an adjustable comb.
This picture shows both an adjustable buttplate and an adjustable comb. The top of the stock can be raised or lowered to fit your face and shooting style, instead of you having to learn to fit the stock, the stock can be made to fit you.
It seems to me that if THAT gun had screw-in chokes, it would have said, in the ad, "Rem-Chokes", but I didn't see that.
Meddle not in the affairs of dragons, for thou art crunchy, and taste good with catsup - George of Lod, Year of Our Lord 297
I always take precautions.
Beware the Evil Bullet Fairies.