They are good pistols for the price. Accurate and reliable. There is even a team witness that shoot competitions in several different categories.You canbuy different slide assemblies and have multiple guns with one frame. Must be the proper frame though for all calibers to interchange. There are alot of different set ups and parts to customize them with. I hope it is the steel frame. Check out this link
http://www.eaacorp.com/index.html Clickon parts over to the right and it can take you to a whole section of customs for the witness.