Sinclair International AR-308 Cleaning Link Features The Sinclair International AR-308 Cleaning Link uses the rifle s own rear locking pin and locking pin hole to attach so there is no extra hardware to lose or fumble with during a cleaning session. Once installed it holds the upper and lower receivers together in an open position giving clear access to the breech for thorough bore cleaning with a rod guide. Built from Delrin and stainless steel the link resists degradation from bore solvents and cleaning chemicals that would eventually wear down softer materials. This combination of simple design and durable materials makes it a lasting addition to a cleaning kit. The link is designed primarily to fit the Armalite AR-10 and most other takedown pin platforms will require fitting before use. It is not compatible with POF .308 rifles the Windham Weaponry SRC 308 or the Colt LE901 which use .250 diameter takedown pins and require the separate AR-15 model link instead. For shooters running a compatible AR-10 platform this link turns a routine bore cleaning into a quicker more controlled process. It is a small tool that solves a persistent annoyance for anyone who cleans their .308 AR regularly. Sinclair International AR-308 Cleaning Link Specifications Brand: Sinclair International Model: AR-308 Cleaning Link Material: Delrin and Stainless Steel Compatible Hosts: Armalite AR-10 Purpose: Bore Cleaning Access Available At: GrabAGun