I have a 20gs sxs flint, circa 1790 that I want to bend the stock so I can shoot it better. The stick is WAY too straight for me so I need to increase the DAC and DAH. Would add 1/4” cast at the same time. In my case, the gang and trigger guard should not pose a problem as I want to bend the stock down and that tang is quite short. A long tang would cause a problem as bending the stock down would open up a gap behind the tang. Of course it will also cause the wood to interfere with the trigger guard tang so it would need to be re- inlet. Might try to bend it myself, don’t think it as all that difficult.