What spring and buffer combo to use? Am mulling over a 20" A1 profile upper build (with Fulton's CL 1:8 twist for the modern heavier ammo) using a PRI triangular FF handguard but don't want a fixed stock. Since the A5 is *essentially* a rifle-length buffer tube I was wondering what a good spring/buffer combo for the 20" pressures and velocities would be.


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