A trap gun will be heavier, have a higher rib, have an adjustable comb and besides other personal quirks, it will be built a whole lot stronger. Of course you don't need all of this if you aren't looking for a dedicated trap gun. But you shoot 10 000 rounds through a model 37 and the same amount through a BT99 and see which one held up better. First thing we need to know is what amount of shooting you will be doing. A lot of people comment they want a gun for trap shooting without saying what volume of shooting they will be doing. If you are only talking pasture clays or a weekly outing to the local club where you shoot a couple of boxes, pretty much any gun will stand up for awhile. That is not dedicated trap shooting. If you are talking 10 000 to 30 000 rounds per year, guess how long the model 37 will last. But regardless of how many shells you are shooting, it is still not worth the money to pay someone to install a rib on a model 37. The gun is still to light and it won't stand up to long term use. But it's your money. By the way, I have seen BT99's on here for around the $700.00 price, gave or take. How much do you think it will cost to purchase a rib and have someone install it who knows what they are doing? Probably half the price of a used BT99. Unless like I said in my earlier post, you know someone who will do it for next to nothing. To borrow a line from the guy in the ING commercials, " save your money".