Expert Review: Titleist 620 MB & CB Irons


Unlike the radical change that saw the Titleist AP series retired and the T Series irons (review here) introduced, the Titleist 620 MB and CB irons only feature subtle refinements compared to the 718 MB and CB irons.

The MB stands for ‘Muscle Back’ and CB stands for ‘Cavity back’. And, although these are a continuation of a long line of players irons from Titleist, I still think it’s important to detail the changes and performance of these modern classics.

Both sets are forged from 1025 carbon steel and feature progressive blade lengths for premium feel and playability. The lofts and profiles are identical making it possible to seamlessly create a mixed set of 620 CB and MB irons.

The long irons of the 620 CB irons have tungsten co-forged into the heel and toe for greater stability, a lowered CG and a touch of forgiveness.

Much like the T100 irons, the feedback from players revolved around thinning the topline, reducing the offset and a refining the sole for better turf interaction.

When gathering images for the T Series review, I took the opportunity to sneak in a few swings with each iron and get a feel for the new 620 MB and CB irons.

Launch Monitor Numbers: 620 MB and CB Irons

With limited time, I did not have a chance to put in a proper warm up, so the numbers above are from completely cold swings. I started with the Titleist 620 MB irons paired with a Project X 6.0 shaft before testing the 620 CB irons with a Project X LZ 6.0 shaft.

Titleist 620 MB Irons
Titleist 620 MB Irons - address view
Titleist 620 MB Irons - face view
Titleist 620 MB Irons - sole view

Instantly, I loved the balance and feel of the MBs. As I stated in my Wilson Staff Model Blades review, muscle backs are the kind of irons I feel most confident with. The solid, forged construction translates into the fullest and most responsive feedback.

The 620 MBs are no exception, their feel is smooth and responsive. Visually the blade has a thin topline and minimal offset, but the most striking feature is the clean looks to the back of the iron. The only marking is a centered Titleist script.

Titleist 620 CB Irons
Titleist 620 CB Irons - address view
Titleist 620 CB Irons - face view
Titleist 620 CB Irons - sole view

I noticed many of the same characteristics as I switched over to the Titleist 620 CB irons. Just like the MBs, the CBs have a quintessential players iron look, thin topline, small offset and no visible technology or bloated sole sticking out at address.

The proximity of all the swings were very tight, the furthest offline a shot landed was only 8 yards. Taking natural swings, I saw a tight little draw, but I was also able to move a ball left to right without issue.

The Titleist 620 MB and CB irons are full performance, top of the line, forged iron sets meant for the best ball strikers in the world. Choose a complete set of one model or combine the CBs and MBs for a well-balanced set.

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Keith Schneider

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Keith SchneiderAge: 34 Handicap: 4.9 Introduction to golf: Age 14 Playing years: 20 Rounds per year: 75+ Hole in Ones: 1WITB Driver: Titleist TS2 10.5° Project X HZRDUS Smoke 65 6.5 3 Wood: Cobra King F9 Fairway Wood 3-Wood Project X HZRDUS Smoke 75 6.5 2-Iron: Mizuno MP-18 MMC Fli-Hi KBS Tour C Taper Lite Stiff 1° weak 1.5° upright Irons: Mizuno MP-68 (4-PW) +1/2" Dynamic Gold X100 2° upright Wedge: Titleist Vokey SM7 51° 8° bounce Dynamic Gold S400 F Grind Wedge: Titleist Vokey SM7 Wedge Works 55° 14° bounce Dynamic Gold S400 F Grind Wedge: Titleist Vokey SM7 Wedge Works 60° 6° bounce Dynamic Gold S400 K Grind Putter: Scotty Cameron Studio Style Newport 2 35" Balls: Titleist ProV1x, TaylorMade Tour Preferred X or Callaway Chrome Soft X

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