Frontline 4.0

47g of MIM tungsten pushed to the face corners creates a forward CG that delivers off-center stability — putts rolled remarkably straight on mis-strikes thanks to the front-CG reducing gear effect, and the SOFT insert keeps distances consistent across the face. As a true blade the chassis has a smaller MOI envelope than the mallet siblings, but the forward-CG design partially compensates — mid-pack blade-class forgiveness.

Independent ClubTest 2021 tester feedback: the face lends instant feedback and really helps with distance control. SOFT normalises ball speed across the face — no matter where you strike the putt you get consistent speed and consistent distance. The combination of front weight and SOFT made the putter roll the ball an accurate distance every time. For putter speed / roll consistency, the forward CG plus SOFT combination is a real, repeatable distance-control feature.

Plumber's neck with moderate toe hang — fits a slight arc stroke. A traditional Anser-style blade with a 350-gram head weight, plumber's neck and moderate toe hang for a slight arc. Buyers with that stroke get a clean arc-fit; those with face-balanced / straight-back-straight-through strokes need the 8.0 sibling (single bend hosel) instead. For putter arc-fit, the 4.0 nails its single arc target but doesn't offer a multi-arc option within the model.

The Frontline feels very soft at impact — on centre strikes you almost don't feel the ball, providing a buttery smooth feel, especially for a putter with a firm insert. The SOFT insert delivers a soft off-face response across the family chassis. For a value-tier blade, this is a premium soft tactile signature — sits just below the calibration anchor for premium milled putters because the family-wide insert lacks the consistency of milled-face counterparts at higher price tiers.

A mildly peculiar sound profile — well-struck putts have a very muted, quiet tock; putts off the toe or heel have a much louder, sharp click. Centre-strike acoustic is a soft, muted tock with clear miss-feedback, though reviewer reactions to the heel / toe click diverge. Clear centre-vs-miss differentiation but the off-centre acoustic is polarising — below the calibration anchor for premium milled blades because the off-centre click breaks the otherwise quiet character.

Matte black is a really good look on the eyes — a very stealthy appearance with an all-black midsize grip, black putter head with silver / grey insert and weight injection, black shaft, and a sleek black head cover. The 4.0 specifically does NOT carry the family's 2135 alignment system (taller-face blade with a single sightline) — premium stealth aesthetic but alignment help is the lowest in the Frontline family. A classic Anser silhouette executed cleanly — sits at the top end of value-blade aesthetics but below the dedicated alignment-aid mallets.