I don't know about 4 1/2 and 5 1/2 but I like 2 1/8 and 3 1/4. You actually need a long neck and/or shoot with your head up, not out-stretched like a turtle. If you keep your weight 50/50 on your feet you'll find you'll want to stand more erect with a more erect head and then those awful stocks will fit. And you won't be " lifting your head " - it's already up. Maybe those old guns were stocked correctly after all.