Weight - A sporter will normally weight between 8 ounces and a pound more than a field gun.
Rib - A sporter will usually have a higher rib and might even have an adjustable rib.
POI - The point of impact on a sporter will usually be higher than a field gun...if you see something like 60/40 it means that 60 percent of the pattern should print above the point of aim and 40% below. A field gun is usually 50/50.
Comb - a sporter might have a higher or adjustable comb where a field gun usually has straight comb
Barrels - as mentioned Sporters are typically 30" or greater for a better (longer) sight plane, a field gun will usually be 28" or less for handling in bush or a blind.
Chamber - some sporters will only have a 2 3/4" chamber so make sure you know that if you ever intend to shoot duck or turkey loads out of the gun, most field O/U's will have 3" chambers but pay attention
Recoil pad - a sporter will probably have a better recoil pad - ie something more than the red rubber pads on a lot of field guns.
Build - a sport from a name brand company should be built to run 100,000+ rounds where a field gun (usually to save weight) might need some parts replaced earlier than that.
Ejectors - some manufacturers have a way to turn off the ejectors in their upper end sporting guns - I've never had a problem with ejectors at a clay's range, I just cover it with my hand and catch the empties but it bothers some people
Trigger - Sporting guns will usually have a way to adjust the length-of-pull by moving the trigger forward or back - they might also have several different trigger shoes that you can choose from - wide, narrow, checkered, or canted.




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