CNC Machined Red Housing · Hardened S136 Internals · Threaded Pin · Made in Texas
This is the CNC Kabuto FRT, and it's the cleanest machine work we have ever put on our shelves. It's made in Texas by one of the true pioneers of the Kabuto design. The housing is CNC machined from 6061 aluminum and anodized a deep red, so it won't crack at the shelf the way nylon and printed housings can. The lever, activator and pin are CNC and EDM cut from S136 steel, then hardened and blackened.
Searching for the Kubota FRT? Kabuto is the correct name for the design, and this is the one we carry now.
It ships with a high-grade PLA 3-position selector, the industry standard on Kabuto kits, on a housing that's a big step above standard.
Want a metal selector? Upgrade to our monolithic CNC machined selector, or pick a CNC ambi selector in black, red, blue or gold. Build Your Own Custom Kabuto →
What Makes This Kabuto Different
Billet red housingCNC machined 6061 aluminum. Pre-trimmed to fit more lowers and uppers, with a beveled top so your upper closes down easier.
Hardened S136 internalsLever, activator and pin are CNC and EDM cut, then hardened and blackened.
Threaded 5.5 mm pinThreads in for an easier install and stays put. No more chasing a pin that walks out.
Front lever blockerStops the lever from falling forward and getting stuck under the hammer.
AR-15 · AR-pattern PCC (9mm, .40 S&W, .45 ACP) with minor fitment
BCG required
M16-profile (full-auto cut)
Buffer
H2 minimum, H3 preferred
Origin
Made in Texas, USA
Fitment: Read Before You Install
The Kabuto works off the top of your lower receiver, so the distance to the safety and trigger is different on every lower. That's why no single activator length fits every rifle. The housing is pre-trimmed to fit as many lowers and uppers as possible, but tolerances vary from manufacturer to manufacturer, so some rifles will need minor shaving.
Activator length check: the bottom tip of the activator presses the trigger down to reset it. If the tip is too long, it can't travel all the way down and pushes the whole assembly up, which binds the bolt.
To test: push the lever all the way back into the reset position, then look at how the housing sits. If the housing lifts, the activator tip is too long. Shave the bottom tip a little at a time until the housing stays seated.
Watch: Full Kabuto Install and Tuning Walkthrough
Running it in a PCC
The Kabuto also runs in AR-pattern pistol caliber carbines in 9mm, .40 S&W and .45 ACP. PCC lowers and bolts vary more than AR-15s do, so expect some minor fitment and adjustment: activator tuning, buffer and spring choice, and a function check before live fire. Take the time to tune it and it will run.
Required hardware
M16-profile (full-auto cut) BCG. A semi-cut BCG will not engage the reset. We run the MPI Nickel Boron M16-Cut BCG.
Full-power ammo. Underpowered loads may not cycle far enough to engage the reset.
Function-check on Safe, Semi and Forced Reset before live fire.
What's in the Box
CNC Kabuto housing (6061, red anodized) with S136 lever and activator
5.5 mm threaded pin
High-grade PLA 3-position selector
Frequently Asked Questions
Can I get it with a metal selector?
Yes. Same CNC aluminum housing and hardened S136 internals, with your choice of a monolithic CNC selector or a CNC ambi selector in black, red, blue or gold. Build your own custom Kabuto.
Is the Kabuto FRT good?
The Kabuto is one of the most popular drop-in FRT designs because it's simple and affordable. The weak point on most kits has been the housing. This one is machined from solid aluminum, so the part that used to crack is now the strongest part of the kit.
Will it fit my lower without any work?
Often, but not always. If the housing lifts when the lever is in the reset position, shave the bottom tip of the activator a little at a time. The walkthrough video above shows the process.
Does it work in PCC builds?
Yes, in AR-pattern PCCs in 9mm, .40 S&W and .45 ACP. PCC lowers and bolts vary more than AR-15s do, so plan on some minor fitment and adjustment, mainly activator tuning and buffer setup, before it runs right.
Does it need a full-auto cut BCG?
Yes. The Kabuto needs an M16-profile (full-auto cut) BCG to engage the reset. A semi-cut BCG will not work.
Is the Kabuto FRT legal?
Forced reset triggers fire one round per trigger pull, but some states restrict them. Check our state-by-state FRT legality guide before you order. It's your responsibility to know and follow your local laws.
I was sent the wrong frt
I ordered the kabuto- black selector in red
I got one with just plain aluminum and a 5 piece selector made of pot metal. On side piece of the selector was broken in half.
I’m ok with the aluminum unpainted part but I would like the black steel selector if possible or I can return the complete one you sent and you can send the correct one. Please let me know.
Update: I would like to say, I submitted this earlier today and their response was just shortly after. I sent pictures of the part and immediately they rectified the problem and sending the correct order. I will definitely telling all my friends and I will be purchasing again!!!!
Thank you
My frt had nothing to stop it from falling off the rails and not working . So currently it doesn’t fit without a mager adjustment on my Meltech lower or having to need a new lower
Was super easy to install the 3 way selector and it's awesome it works with the drop in. They do require some trim or some riffle but not to worry because if you take too much off he is for real about sending you another piece!
Fitment is terrible, there is a ton of slop in the mechanism, the safety is cast and poor quality material, the selector switches on the outside of it hold tightly to the safety bar but the bar itself is terrible quality.
The FRT is so loose in fitment that every other round was a dead trigger with a dropped hammer
If the plastic parts were metal it would be cool. The housing is too flimsy. There is no retention for the pivot pin and the selector levers breaking is a question of when, not if.
