It's not so much a gimmick as it is a compromise. They're sleek to match the barrel profile and they're radial which is OK for reducing muzzle flip but less so purely for recoil reduction. If you want maximum recoil reduction, make the rifle heavier and install a directional brake. The shape of the factory tikka stocks doesn't do them any favours either.
Maybe a bigger suppressor will reduce recoil a touch. But probably more because of the extra weight than the design, because all the gas is still venting forward. And whether this is enough of a difference to really be able to feel it... dunno.
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