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This is the same principle exploited by Johnny Rowland only in reverse when it came up with the. Since the standard 9mm spring rate is 17 pounds, adding a "functional comp" will prevent the slide from cycling.as you have discovered. The end result is the slide remains locked longer and upon opening has less velocity and energy. The net result is a portion of expanding muzzle gas is diverted along a path other than parallel to the bore axis, reducing breech thrust, combined with the effect of high pressure gas pressing forward on the internal "walls" of the chambers. Additionally, the gases are vented in such a manner as to reduce or eliminate muzzle rise. Think about what a compensator "capturing" expanding gas in the expansion chamber it adds significant "forward thrust" to the barrel, which in turn holds the slide in battery due to the locking lugs. When you add a compensator, but intend to run standard power ammo, you'll need to back off the recoil spring, but you can keep the Tungsten guide rod since it isn't part of the reciprocating mass.the spring compresses along its length, but the rod itself does not move forward or backward during cycling. Click to expand.I guess your experience puts to rest the notion that muzzle brakes (compensators) "don't do anything!"