I believe I'm sold on the A5 buffer system. Gives a bit more LOP and reduces the violence of the action while cycling. Not any more expensive than the standard buffer system with a couple of valid benefits. Vltor keeps running out of parts so I'm currently using a TRIARC tube, Geissele Super 43 rifle spring and a Vltor standard weight buffer. Switching out the TRIARC for an SOLGW this coming week. The TRIARC is a 5 position tube while the SOLGW is 7. Makes a difference to me.