All the old Trojans I've owned worked like a Swiss watch; but at this point, even on the "newest" examples stock wood is now very old. If I were you the only precautions I'd take on a shooter grade Trojan would be lengthening the chambers to 2 3/4" (plenty of wall thickness on a Trojan 12-bore), and have the stock head reinforced and glassed. With those two things done, I'd shoot all the targets I wished and not worry about the stock, or gun any further.
I firmly agree with Topgun. Nothing more needs to be done to your gun. When the stock is removed for degreasing and glassing any hidden internal cracks will also be repaired. Personally, I probably wouldn't worry about lengthening the chambers the extra 1/8". There's no need or benefit. Remember, Parker intentionally cut the chambers a tiny bit short but recommended 2 3/4" ammunition. Enjoy....and quit worrying!
