VLTOR Weapon Systems Buffer, Buffer A5SH2 Specifically developed on the request of the United States Marine Corps, the VLTOR A5 Buffer System is considered to be one the most beneficial upgrades to the AR platform in the last increasing the reliability, accuracy, and performance of AR pattern weapons. For the operator that requires a specially weighted buffer, or wants to fine tune their weapon, the VLTOR A5 buffers come in five unique weights.