NEW Version Fits Most .308 Lower Receivers
Drop-In Modification - No Fitting Required
The New Tier5® AR-308 MBC® will fit most .308 lower receivers. It is larger than the Mil-Spec AR-15 MBC®. Some .308 receivers utilize Mil-Spec AR-15 bolt catches. The New Tier5™ AR-308 MBC® will fit Palmetto State Armory receivers without any modifications.
This will NOT fit S&W M&P10-308 and some Lower Receivers that have ambidextrous bolt release.