We have found that the A5 buffer system makes for the most tunable, reliable, and smooth shooting system for typical AR-15 builds. Without detailed knowledge of a build, we recommend a "green" sprinco rifle length buffer spring and A5H2 buffer.
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.
Specifications:
Buffer Body Material: 7075 T6 Aluminum
Finish: Type III Clear Hard Coat Anodized
Buffer Weights:
A5H0: 3.8oz
A5H1: 4.56oz
A5H2: 5.33oz
A5H3: 6.08oz
A5H4: 6.83oz
*Only for use in "A5 length" buffer tubes/receiver extensions