We all know about the little dimple in the mag tube in an 870 that prevents one from adding an extension. Well, today I ran across another little surprise. I'm changing the buttstock on my 870 Express. I'm putting a wood 870P buttstock on it and the hollow tube that runs the length of the stock is much bigger than one in the original stock. Sheesh! Looks like I either need to put a long bushing in there or just add a bigger washer. And to top it off, I can't get the forend off. I tried a pair of needle-nose pliers as was suggested in another thread, but that sucker's on there tight. This is not a good day.