The TCS AR-15 bore guide is an essential cleaning tool for maintaining the long-term accuracy of your firearm. It ensures the cleaning rod remains perfectly aligned, preventing contact with the barrel's sides. To utilize this tool, first detach the upper receiver of your AR-15 style rifle, then retract the charging handle and remove the bolt carrier group. Insert the bore guide into the upper receiver where the bolt carrier group is typically located. Position a patch treated with TCS bore paste at the back of the bore guide. Using a TCS bore jag on a TCS rod, push the patch through the bore guide and into the bore. Follow this with TCS Solvent. This high-quality tool is proudly manufactured in the USA. Compatible with the majority of AR-15 and M-16 style rifles chambered in .223 Cal/5.56x45mm AR-15 bore guide with anodized aluminum construction Rubber O-rings for AR-15 bore guide - precision-engineered elastomeric seals designed to ensure optimal alignment and prevent contaminants during firearm maintenance and cleaning procedures