RNV Designs Katana Mech Mod: A Review

May 15, 2019

RNV Designs Katana Mech Mod: A Review

One of the many things that I love about mechanical mods is their longevity. While regulated devices generally have a relatively predictable life cycle and are bound to be replaced by newer versions with flashy new options or designs, a mech tube remains a classic in both looks and operability. The Katana from RNV Designs is a good case in point. I’ve had two Katanas (one in brass and one in nickel) since 2016 and they remain some of my favourite mods.

The Katana is a beautiful mod to look at. It is CNC machined with deep incisions in a distinctive pattern. It measures 25 mm across and is 84 mm tall. The brass Katana weighs 153 grams while the nickel plated naval brass version comes in at 155 grams. Both versions feature a copper hybrid top cap. The switch contact is copper inside a brass housing and features two strong magnets. Venting is along the bottom part of the tube near the switch.

The switch has a short throw with no grinding. It is not a soft switch, requiring heavy pressure to fire. (If you like a softer throw, check out RNV’s B&W Reversion.) It feels quite substantial in the hand: very solid with a good weight to it. The nickel version cleans like new with just a quick wipe with any cloth. After years of use the nickel plating still looks brand new with no marks. The brass cleans up well with Brasso, Swipes, or any of the typical cleaners used on brass mods. It does take a bit of extra time (with the brass) to ensure even cleaning because of the deep sculpting/incisions. I quite like the look of the brass when only the outermost surface is polished to a high shine: it really draws attention to the Katana pattern.


The Katana is powered by a single 18650 and I tend to like using it with coils that come in around a resistance range of 0.18 to 0.22 Ohms, like the 3mm 0.36 SFC or the 3mm 0.44 Aliens. (I use a Sony VTC5A; build within safe limits for your battery.) It fits a 25 mm atomizer perfectly. I’m glad there are more options available these days: I’m currently using the nickel version with the SS Fatality M25 (featured photo) but I also use the Goon 25mm and the Terk V2 when I want an RDA instead of a tank. Alternatively, the Muira cap is designed to go on top of the Twisted Messes 24 and matches the mod perfectly.


My partner likes to determine the value of a purchase by total price divided by the time she expects to be able to/want to use it: by that measure this mod is a heck of a deal considering the years of use I’ve had with each of mine. And they’re still in the rotation. I highly recommend this mod to any mech collector who likes a elegant look and solid construction paired with the high quality RNV Designs is known for. This is definitely a classic from their collection.





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