Chamber Length is measured from the breech face to the start of the forcing cone. And this should coincide with the length of the FIRED shell or the shell can be sorter. Or a hair longer is ok without adverse effects. If a 20g shell is 2-3/4" then it should be that long when fired. Loaded length does not mean anything.
If your chambers are 2.5" like many Parkers are, that would be a 1/4" difference between the chambers and the shell. For some, this is too much for comfort, others do not mind. I only mentioned it because you should heck it out any know what it is and also know that there are sell manufacturers that make 2.5" shells. Like RST.
Regarding the forend. Having one made for it would certainly be easier than finding a good replacement, but it would be more expensive. But with patience, finding a use don't can be done. If it has a beaver tail on it. That can also be modified to be a correct splinter. MAYBE.
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B. Dudley
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