Chuck,
Parkers are so interesting at least in part due to the many frame sizes. I have a #5 Frame Lifter 10 Gauge and 10's in #4, 3, and 2 Frame sizes. A #2 Frame may accept 12 or 10 gauge barrels (if properly fitted to the action). There were few #3 Frame 12's but you will see them on auction sites if you look.
I do not know the frame size of your new back action gun. Measure the maximum width of the barrels of that gun and your #2 Frame barrels (correct, marked on the barrel recoil lug). The back action 10 ga may be similar to a more modern #2 Frame. I DO NOT think the barrels will interchange. Also, DO NOT try to interchange barrels without removing the cocking hook. See the technical setion and also recent posts of those who got caught by the hook. Just because the frames are the same size does not mean that the barrels can be interchanged. If they are from the same type, i.e. Top Lever Hammer Gun, the barrels may be able to be fitted to the action. If you are lucky they may snap into place. Chances are greater for this if the barrel sets are close in serial number.
Stocks, fore ends, and barrels are hard to find but they do turn up. Keep your eyes open and do not heistate when offered to you. One can always sell but one can only rarely buy.
PS: I own a E Grade Hammerless 10 gauge on a #2 Frame with a set of VH 12 gauge barrels that were fitted to it. The 12 gauge barrels were cut to a bit less than 24" and are not much good for anything. Even with the short barrels the gun weighs 8 lbs! But, it is still neat to have a gun with 2 different gauge barrels!
Mark
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