kac 3.1 10.75

AR/M4 AR General Discussion
1

Does anyone have a pic of one on an 11.5 upper? I have been looking for a while and can’t find a pic.

2

https://www.m4carbine.net/showthread.php?p=1622980
First post on page 65
DD 11.5 with URX 3.1 10.75