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Sub 70 639 MB Plus Forged Irons

Please allow 2-4 days for assembly before your clubs ship. Each set is custom built when ordered.

Availability: In stock

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The Sub 70 639 MB Plus was designed by the club makers at Sub 70 in response to a consistent question they got during their many years of building clubs and fitting golfers: am I good enough to play a blade? For anyone who has asked themselves that question and been afraid to invest in a club they may not be skilled enough to hit consistently, the MB Plus is your answer.

Like its brother the 639 MB, the MB Plus is a classic looking iron that is precision forged and CNC milled from a single billet of DT-4 super soft steel, which provides the same buttery feel and responsiveness that players look for in a blade. From there, the top line was nominally widened, the offset deepened, and the heel to toe length of the blade made slightly longer. These three changes were specifically tested until the club had the largest possible sweet spot while also allowing workability and providing feel and feedback to the player. The iron is finished in a handsome and utilitarian brushed satin to reduce glare, and the muscle back provides ideal launch parameters and maximum energy transfer for distance. Perhaps most importantly, the larger blade size, deeper offset, and slightly wider topline all have the combined effect of instilling confidence at address, allowing a player that once asked the question, to now have an answer.

Head Number 3 4 5 6 7 8 9 PW
Loft 20 22 25 28 32 36 40 45
Lie 59.5 60 60.5 61 61.5 62 62.5 63
Offset 4.8 4.6 4.2 3.7 3.4 3.1 2.9 2.6
Bounce 1 2 2 5 5 5 5 7
Head Weight 242 249 256 263 270 277 284 292
Standard Length Steel 39 38.5 38 37.5 37 36.5 36 35.75
Standard Length Graphite 39.5 39 38.5 38 37.5 37 36.5 36.25
Material DT-4 Steel
Sub 70 Iron Models
Model Category Characteristics Suggested Handicap
739Game Improvement Higher Launch, More Distance, Most Forgiving15+
699Players DistanceModern Head Shape, TPE Injected Face, Max Ball Speed/Distance and Launch5-15
639 CBPlayers Cavity BackCavity Back Head Shape, Forged Soft Feel, Workable, Great Feedback0-8
639 MB PlusPlayers Muscle Back/Blade Blade Style Head, Forged Soft Feel, Longer Heel to Toe (compared to MB)0-8
639 MBPlayers Muscle Back/Blade Compact Blade Style Head, Forged Soft Feel, Ultimate Players Iron, Very Workable0-5
Customer Reviews (3)
Great Feeling Irons
I first tried the 639 CB. They were ok but not better than my Ping I15's. I then tried the 639 MB+. I was surprised how good they felt and their nice launch angle. They are larger than most irons but not too big. I ordered them 2 degrees flat w/ KB Tour Stiff Shafts.

I am a mid single digit player but am over 60 and never thought I would be playing a blade. It was apparent a set of the MB+'s would be in my future when I was excited every chance I had to hit the demo 9 and 6 irons in my bag.

I have had them a month and very happy to be playing them. They have replaced the I15's and a set of Apex Pro Irons.
Review by FlaGolfer (Posted on 9/16/2019)
Take dead aim!
Previously demo’d The 639CB and was very impressed. Have now played the 639MB (8 iron) for past two weekends w/ Project X 6.0. Incredibly accurate, great feel and beautiful design. Was a bit nervous initially and didn’t hit great on first range session. Since then, however, really been able to stick much closer to pin from 155 - 165 out. I won’t say that I attack the pins (I’m not that good), but these appear to help me align and swing with confidence. In the two weeks using this 8 iron on my approach shots, have had at least 3 birdies and multiple pars just missing the putts (again, I’m not really that good at a 15HC but the game is serviceable) - thinned a few shots too and that’s not overly pleasing to the hands, but more good than bad shots. Distance is good, but not quite as noticeable of a difference from the Ping I210 8 iron, where the 639CB is definitely a 1/2 to full club longer.
Judge for yourself - if your a solid ball striker, don’t be afraid of either the CB or MB, I think you will like them
Review by Pin Hi (Posted on 8/25/2019)
Quality clubs
Overall: A+

Looks: Too notch - you know this because they’re pictured above. The swirling on the bottom half is overstated in the pictures i think. But they look badass.

Feel / Playability:

Having hit plenty of clubs, of all types and brands. IMO these are true blades despite the plus category. Good swings and ball striking are rewarded with butter like feel, consistent distance and elevated spin. Miss hits are punished - you will feel them. You will sacrifice distance and the club feel & vibration tells you how bad.
I love this, which is why I bought blades. Feedback.

Quality / Durability

I have played approx (6) 18 hole rounds and have not found and issues with wear or build quality. It is early but there is no reason to think these won’t last.
Review by Bk (Posted on 8/19/2019)
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