The BPS Hunter model from Browning site
http://www.browning.com/products/ca...d=012&type_id=211&content=bps-hunter-firearms
The BPS Upland
http://www.browning.com/products/ca...pe_id=216&content=bps-upland-special-firearms
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the primary difference is the length of barrel on the Upland model / the current catalog lists them in 12ga at 22" ( which is very short - it makes the gun real "whippy" ). The length of pull on the Hunter model is 14 1/4" and the upland is 14" - both are pretty short ( I like mine at about 14 1/2") - but drop at Heel and drop at Comb are the same on both --- and weight on upland is a few ounces less. They list new for about the same price $ 599 but I think the average street price new is around $ 525.
"Fit" is the big thing on a shotgun / so it hits where you look. You may find over time / that you need less drop at comb and/or heel - but either can have comb pads or different recoil pads put on them to "fit" you.
I also like a little more weight in my typical "field gun" ... in a 12ga up around 8 1/2 lbs is better for me / so the weight helps me smooth out my swing on follow thru. If I go shorter than a 28" barrel / I tend to steer the gun with my forward hand / and it gets too whippy --- where I "swat" at targets or birds vs shoot smoothly and follow thru smoothly. Remember - pulling the trigger on a shotgun is the start of the shot ( not the end ) -- you have to follow thru / or you will be behind every thing ...
The longer barrel gives a longer sight plane too ...which is a plus. The argument for the "upland" is in a brushy area .... guys want a lightning quick gun for grouse, etc ....but frankly, I'm just as quick with a 28" as I would be with a 26" or 24" ....and I can shoot them way better / and they're more versatile ( for me ) .... What works best for you / don't know ....
The resale on the Hunter model, in 28" --- will be way better than the Upland model ---because a lot more shooters will adapt to it better than the shorter 22" barrel ( for birds, clays, etc )... I've even gone to a 30" barrel on my semi-auto / and 30" barrels on my Over Unders which I bird hunt with a lot as well. A Browning Citori XS Skeet model, in 12, 20, 28ga - all with 30" barrels and a parallel adj comb are my primary guns for bird hunting, Skeet and Sporting Clays. For Trap I go - even heavier and longer - Browning XT Citori, 32" barrels, and a gun at around 10 lbs ....
remember - models change over the years too / or someone might have ordered that used Upland model with a different barrel ....but the basic BPS has been the same action for a long time.
There are 2 choke systems / the older guns ( prior to about 1990 ) had the "Invector chokes" - they screw in but they are about 1" in overall length. Since around 1990 - Browning went to the Invector Plus - where the screw in chokes are about 3" long. They are Not Interchangeable ...
The Invecotor Plus system - seems to be a little better ....but my older Brownings - a couple of old Citori Lightning's - and the 2 pump guns -- are both the older Invector style and they pattern just fine. The last several guns I've bought ( XT's, BT-100, XS Skeet models, etc ) were all Invector Plus systems ....and I typically use the Browning Midas grade extended chokes for all those guns...).
good luck.