Austin Custom Brass

Austin Custom Brass MV 3C Special Mouthpieces

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  • Austin Custom Brass MV 3C Special Mouthpieces
  • Austin Custom Brass MV 3C Special Mouthpieces
"I didn’t need to play around on it for more than a few minutes to know it had rendered the previous dozen mouthpieces I purchased unnecessary. It’s extraordinary." -Ryan Wooden


My #1 selling mouthpiece at ACB!

I have often wondered why you see the eBay auctions of Bach Mount Vernon 3C mouthpieces routinely sell for $400 or more. Is there something special and different about these pieces versus a modern 3C?

Well... the answer I found out is YES!

The only problem was that the rarity and price of the vintage Mt. Vernon 3C mouthpieces made them inaccessible to most players. The ACB MV 3C makes this sought-after design available again, at an affordable price.

Check out the overlay below for a comparison of my standard 3C (in red) to the ACB MV 3C:



I started this design by scanning four different Mt. Vernon Bach 3C mouthpieces, then combined their best aspects into my ACB MV 3C design. As you can see there are some differences in the rim, the entrance to the throat, and especially in the cup shape and volume. The MV 3C is a bit bigger all around than the traditional 3C. For me it feels a tiny bit smaller than a 1 1/2C, with an exceptionally comfortable rim.

I’ve matched this top with my MO backbore (medium-open, smaller symphonic shape) and a #26 throat. The resulting sound is tremendously rich!

Although this mouthpiece is a little bigger overall than a traditional 3C design, it actually has great efficiency. Many customers have mentioned the great brilliance and core to the sound in the upper register, as well as improved response at softer dynamics throughout the whole range of the horn. Attacks are clean, crisp, and reliable. You can check the reviews below to see what some of our customers were playing before making the switch to an ACB MV 3C.

You can customize the tone a bit more through your choice of outer blank (the most popular choices on this piece are our standard, traditional, and modern blanks). All non-standard blank ACB pieces are custom orders and take 4 weeks.

If you’re thinking about a new mouthpiece in the 3C-1 1/2C range and you want a great all-around option, experience for yourself why the MV 3C has become our best selling mouthpiece at ACB!


If you have additional questions send us an email.

You can also call our Mouthpiece Hotline with questions or to place an order! +1-781-816-9664

Prior to ordering please check our Shipping and Returns policy.

Also note weight indicated in the ad is shipping weight not actual weight of item.

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28 Reviews

  • 5
    ACB MV 3C

    Posted by Ben Winslett on 19th May 2023

    Oh my gosh!! I've never said "I love this mouthpiece" before, but I say it just about every time I sit in a legit setting and use this MV. Back story: I am not too mouthpiece sensitive and don't go on many safaris. For lead I use a Bobby Shew. For Brass Band it's a Denis Wick. And for everything else I just stuck with a Yamaha 16c4 I got with my first pro horn in the mid 1990s. A 16c4 is about a 1 1/2c. Lately I didn't like the blow of it and I had been feeling that the rim was a tad too sharp and decided to ask ACB what they'd recommend (I was given an in store credit after a few friends and students bought ACB horns and decided to invest it in a mouthpiece). I loved the way it played right out of the box. But is that placebo effect? Well I waited more than two months to leave a review to be sure. I've used this in a couple of local concert bands and in my daily routine. I continue to enjoy it every single time. Here's why: 1. There is far more I can do with the sound. It can be warm and it can be soft and sweet, but I can also be very brilliant and powerful, and there is little effort required to make any of that happen. 2. The upper register is way, way easier than my 16c4. It's almost as facilitating as my Bobby Shew in the upper register. Since endurance and range often go hand in hand, I do think I have more endurance on this piece as well. Between rehearsals and lessons, I may play 4 or 5 hours in a day. I'm less tired afterwards. 3. Comfort! This is, hands down, the most comfortable rim I've ever played. The shape is outstanding, and the silver plating is exquisite. It's like a soft pillow for your chops. OK maybe that's overboard, but you get the point. A few years ago, I got curious and borrowed a dozen popular mouthpieces from a buddy with a drawer full. Around that time I tried so many. DS Jet-tone, 5c, 7b, 14b4, 6c, and more. I just stuck with my 16c4 because nothing felt so much better that I actually felt like bothering with a change. With this MV 3C, it was instantly obvious that this was a far better mouthpiece for me. Great job! I'm glad I was able to find this one.

  • 5
    MV 3c mouthpiece

    Posted by Jeff on 26th Apr 2023

    Excellent product. Top quality. Very comfortable. I really like this mouthpiece. Best customer service and support. One of the best brass companies out there .

  • 5
    Very satisfying and very versatile

    Posted by Julien Wurtz on 22nd Mar 2022

    This mouthpiece is a blast to play, very comfortable, vibrant and focused tone, it has everything you want! Great job, ACB!

  • 5

    Posted by Alex Pawlowski on 27th Dec 2021

    I played on a normal 3C, and wanted to see what else was out there for this common size, so I tried the MV3C. What everyone is saying is completely true. It plays fantastic in all registers and all dynamic levels, is very comfortable compared to a 3C, and I have way better range and stronger upper register even though it is a deeper cup! I have it in the modern blank, and it is a gorgeous mouthpiece. It works perfectly in my Adams A4LT, and gets a nice, warm, rich sound. Thanks again to everyone at ACB, and as always I am so happy with the customer service and expertise that they offer.

  • 5
    LOVE IT!!!

    Posted by Glenn Muller on 24th Mar 2021

    Okay, did I say I LOVE IT? I've been mouthpiece shopping for a while. Been playing on a modern Bach 1 1/2C. The modern Bach's just aren't the same as the old Mount Vernon pieces. Tried the shallow version [MV3Cs], but felt a bit too shallow and bright for my taste. Swapped out for regular version [MV3C] with modern slug. Much better, for me. It blows very easily. Love the response and projection. Dynamic contrast is fantastic. I can see why this is such a popular mouthpiece. Thanks Josh & the rest of the team at ACB.

  • 4
    Very comfortable on the lips

    Posted by Aaron Wood on 10th Feb 2021

    This is the most comfortable on the lips mouthpiece I have tried (I have only tried a few to compare). It's a tiny bit bigger than a standard Bach 3C and Curry 3C, for size comparison. Felt more easy to blow and get a buzz going compared to those other MPs I've tried. It might be just a little big for me (at least with as little practice as I do/have time for). It feels and looks like a quality product, so if you have hesitation to trying an ACB custom mouthpiece, I wholeheartedly say "Go for it!" I think I have medium-sized lips -- hopefully I can grow into this mouthpiece, as I really like it for a nice open sound. Also looking forward to trying out a TA-1, which is in the mail!

  • 5
    MV 3C Trumpet Mouthpiece

    Posted by Mark Alderman on 20th Dec 2020

    This is indeed a very accurate copy of the old Bach Mount Vernon 3C trumpet mouthpiece. While not as deep as a current day 3B this mouthpiece is a great compromise as it will brighten up in the upper register, while providing a big full tone in the lows and mids. Perfect for moving between classical, chamber and jazz! Give it a try!

  • 5
    MV3C Quality Sound

    Posted by Greg Kalbaugh on 25th Feb 2020

    Aside from practice at home, used my recent MV3C purchase for the first time last night at a three hour gig. Must say the quality and performance was more than expected. Added a darker resonance of sound to the jazz. Both comfortable and reliable. Found it to be heads above my Bach 3C.

  • 5
    The best

    Posted by Erik on 24th Jan 2020

    I've played Monette, GR, and Curry, but when I discovered this ACB MV3C, it instantly became my favorite and I've been playing this Mpc for years now. For me, it's the great full tone, ease and evenness throughout all registers, versatility in playing all kinds of styles. It's super comfortable and it even looks cool to boot. It's just the best mouthpiece I've ever played.

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