Real Avid makes cleaning your AR-15 easier than ever before with the Smart Lock Bore Guide. This handy item features a clever design that locks you AR-15 upper open at an optimal angle for cleaning the bore. Even better, it does so while aligning cleaning rods perfectly with the bore, protecting your rifle's chamber and throat from damage. Ensure your rifle stays at peak accuracy for as long as possible.Features: Locks receivers open for easy maintenance Perfectly aligns cleaning rods to the bore Reduces solvent leakage into the receiver Protects chamber and throat from misaligned tools