OK. I posted in an earlier post that I recieved a Remington 870 Magnum 20 gauge in a trade for some golf clubs. I have no need for another regular shotgun, and want to change it into a tactical shotgun. I want to change the stock, get a shorted barrell with a front sight, a forward grip with a light. I have not done much work with showguns, and would like any suggestions, especially where I can find the stock for the 20 gauge. I can find tons for 12g but not 20g. Thanks in advance for the info.