Ruger full size 1911 is engineered as combat pistol true to John Browning's original design. Ruger manufacturing specifications provide for a little play in the slide to ensure functionality in all types of conditions - with all types of ammo. The specifications are published by Ruger, and there are zillions of posts on this subject in the US forums. Is a stunning and well received pistol, commonly saluted for its handling and flawless performance considering the low price. The slide tolerance is desireable in a combat 1911, and built in. So don't worry about the so called "rattle" - because that's the sound of dependability. If the slide adjustment bothers you, and you want a real tight action for some reason, well, there are other 1911 options - but Ruger followed the original 1911 design concept with a few modern upgrades. As others pointed out, full size is the original design and means less felt recoil and easier target acquisition. Some like the commander for its shorter barrel regardless of those considerations.