The Selective Integrated Rail System. The S.I.R System is available in both commercial and military models. Neither model requires any modification to the carbine except removal of your current hand guards and the Delta ring on the military S.I.R. model. The S.I.R. System works with any type front sight you may have. No special tools are required to install. A coin is all that is needed. It allows multiple attachments tailored to the needs of the users mission. It is designed to fit mil-spec flat top receivers from Colt Armalite and Bushmaster in the 5.56 carbine lengths. There may be other flat top receivers manufactured that the S.I.R. may fit to properly but the manufacturer does not guarantee or warrantee S.I.R. on any flat top receivers other than those listed above. This modular receiver sleeving system is a hand guard universal mounting system that leaves the barrel totally free-floating while providing a rigid ultra-light platform on which to mount virtually any mission specific accessory like thermal imager lasers night vision optical sight M203 etc.
This item or some of it's components cannot be exported from the United States of America. US Military APO Addresses exempt.