Some trade-in pistols come with a story and a kit. This Glock 21 SF is a former police gun in .45 ACP, and it comes with a Streamlight TLR-1 light, night sights, three magazines, and the Glock box. That is a ready-to-work package, not just a bare frame.

The SF in the name stands for short frame, which slims the grip so average hands can hold the big .45 comfortably. The barrel measures 4.6 inches and the magazine holds 13 rounds. The finish is black.

The seller rates the gun as good and says it is in 100 percent working order. Expect some scratches and dings, and the box is missing one hinge. The seller grades the bore at 7 out of 10 and the overall condition at 7 out of 10, and the photos show the details. That is a straight and honest description, and it matches what you should expect from a gun that served on a duty belt.

Put the light through its paces when it arrives. Check the battery, the mounting, and that the pistol returns to zero with the light attached. Look over the night sights, and test each magazine. It is sold as described, in used condition. It ships to your FFL dealer, where the background check is completed.