IW5M - AUG Proficiency

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Is there any way to put a Proficiency on the AUG? I've tried by selecting a random weapon, placing Kick on it, then changing the weapon to AUG / m60_jugg) / 5A (hex value), then placing a Proficiency on the weapon through Cheat Engine. It is successful to the point where it shows up in Custom Classes. When I join a game, I spawn with my AUG class, and on the right where it shows my Perks, the Proficiency Kick (or any Proficiency) is not displayed, where it should be. Is this because it simply cannot have Proficiency(s), due to it not being a completed weapon; or something else? I am sure I am memory editing it correctly, because it appears so in my Custom Classes: