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... doesn't have the full under lug, but some have them. Although I'm not sure why you need it, plenty heavy the way it is.
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The under lug just does not provide weight to control recoil. The weight bias forward enables a more steady aim as observed in Olympic Rapid Fire pistols that actually have movable weights on the barrels to give an appropriate muzzle heavy effect. So, even in a .22 Rim Fire, under lugs provide an advantage in a more steady aim.