Used quad rail in good shape. These are not as common (or as expensive) as the KAC rails. Fits a carbine gas system. Asking $150 obo PM with questions
https://live.staticflickr.com/65535/...a69519e2_w.jpg2023-09-22_02-16-40 by Willis, on Flickr
https://live.staticflickr.com/65535/...009ec2ef_w.jpg2023-09-22_07-23-57 by Willis, on Flickr