Benchmade Auto Immunity 2900BK – Sub-2.5" Auto AXIS Wharncliffe
The Benchmade Auto Immunity 2900BK answers a request that came straight from federal employees: a hard-use automatic with a blade under 2.5" that stays carry-friendly in restrictive jurisdictions. The 2.49" Cobalt Black Cerakote CPM-M4 clipped Wharncliffe blade focuses all of its cutting force on a needle-fine tip, deploys with Benchmade's ambidextrous Auto-AXIS mechanism, and rides on milled Crater Blue 6061-T6 billet aluminum handles. The included lanyard extends the compact handle into a full, fast-access grip. The Immunity line was conceived, designed, and developed entirely during the pandemic, hence the name.
Specifications
| Blade Length |
2.49" |
| Blade Steel |
CPM-M4 (62-64 HRC) |
| Blade Style |
Clipped Wharncliffe, Plain Edge |
| Blade Finish |
Cobalt Black Cerakote |
| Blade Thickness |
0.09" |
| Open Length |
5.94" |
| Closed Length |
3.46" |
| Weight |
2.37 oz |
| Handle |
Crater Blue 6061-T6 Billet Aluminum |
| Opening |
Auto-AXIS Automatic |
| Clip |
Mini Deep-Carry, Tip-Up |
| Lanyard |
Included |
| Made In |
USA |
Frequently Asked Questions
Is the Benchmade Auto Immunity discontinued?
Yes. Benchmade has discontinued the Auto Immunity 2900 series, so the Benchmade Auto Immunity 2900BK is only available while remaining dealer stock lasts. The manual Full Immunity 290 remains in Benchmade's current lineup.
What is the difference between the Benchmade Auto Immunity and the Full Immunity?
The Benchmade Auto Immunity 2900BK is the automatic version: its 2.49" blade fires open via the Auto-AXIS mechanism. The Full Immunity 290 is the manual AXIS-lock folder built on the same sub-2.5" Wharncliffe concept, and the Partial Immunity 2950 is the shorter 1.95" automatic in the family.
How does the Auto-AXIS mechanism on the Benchmade Auto Immunity 2900BK work?
Pull the ambidextrous AXIS bar rearward and the blade of the Benchmade Auto Immunity 2900BK fires open automatically under spring pressure. Pulling the same bar unlocks the blade so it can be folded closed, giving automatic speed with the AXIS lockup Benchmade is known for.
Is the Benchmade Auto Immunity 2900BK legal to carry?
The Benchmade Auto Immunity 2900BK was built with a 2.49" blade specifically because many jurisdictions and most federal buildings restrict blades over 2.5". Automatic knife laws still vary by state and city, so always verify your local laws before purchasing or carrying it.
Does CPM-M4 rust?
CPM-M4 is a high-carbon tool steel, not a stainless steel, prized for its extreme edge retention and toughness. The Cobalt Black Cerakote on the Benchmade Auto Immunity 2900BK protects the flats, but keep the exposed edge dry and lightly oiled to prevent corrosion.
Does Benchmade sharpen the Auto Immunity for free?
Yes. The Benchmade Auto Immunity 2900BK is covered by Benchmade's LifeSharp service, which provides free factory cleaning, adjustment, and resharpening for the life of the knife. It is made in the USA in Oregon City, Oregon.
Where can I buy the Benchmade Auto Immunity 2900BK?
Going Gear is an authorized Benchmade dealer, so every Benchmade Auto Immunity 2900BK we sell is genuine, factory fresh, and fully backed by Benchmade's warranty and LifeSharp program.
