Complete parts kit for a Glock 21C so you can just slide your standard slide off and slide on a complete compensated slide assembly. The kit includes the compensated barrel, slide with two notches for the ports to exhaust through, the spring/guide assembly, all the receiver internal parts and two ten round mags. All you would need is the receiver to build a complete pistol.
I am looking for $400. Pictures are available upon request. Please let me know.