I have a used Glock 21 gen 3, SF for sale. Low round count and all the springs were replaced last year when I had the gun gone through by an armorer. Has hard case, 3-13rd mags and night sights. $550 in the Bend area at a local FFL. Would also entertain a trade for an AR optic 1-4, 5 or 6 power. 30mm tube in a qr mount. Let me know what you have.