Wheeler Engineering 156-213 AR15 Bore Guide

“Wheeler 156213 AR-15 Bore Guide 1 223 Remington One Size Fits All The AR-15 Bore Guide is precision CNC-machined aluminum with a durableanodized finish. It fits securely in any AR-15 upper and can be retained inplace by closing the dust cover on the upper which engages a groove in theguide. The bore guide also has chemical-resistant O-rings for retention inuppers without dust covers. It works well with .223 and .204, extendinginside the chamber to prevent solvent from leaking into the action. Asolvent port is conveniently located to the rear of the guide which extendsout of the upper making it easily accessible during cleaning. Inner tubediameter is .250″” (not intended for 6.8mm jag).”