The full size SR1911 has a 6" barrel. The commander has a 4 1/2" barrel and so does the LW commander. However the LW commander is steel slide assy and the bottom half is made out of aluminum and about 8 ounces lighter. The bottom part of the LW Commander is also black whereas the Commander and full size is totally stainless.
Have you held the LWC in 9MM? Start saving up!I first purchased the 5" stainless model, then Ruger came out with their 4.25 inch stainless CMD. Just had to have one. Just a couple of weeks ago, my LGS had the Lightweight CMD on sale, and it came home with me. Next, I would like to add a lightweight Nightwacthman to the small collection. I really like all the Ruger SR1911s, and their GP100s also. Good luck with yours but beware, they are addictive.