I run the Vltor A5 with everything I can. It's always been as simple as ordering a Green spring when I buy a kit to do a build, and my rifles run very well this way. You could even say that I build the rifles around the A5H2/Green spring combo, since it's worked from -20 to 101 degrees for me. My 18" precision rigs get the A5H3/Green spring. In a recent thread there was discussion of using the flat wire spring instead, with it's own set of benefits and retractions. Knowledge wanted...
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