They have a working operational system and battle tested tactics, not only procurement. It's not the rifle that distinguishes the special forces, but how it's used.

They built a network centric warefare with starlink and cheap android tablets down to the drone teams in the field.

They built a network of cheap acousting sensors (old phones) as passive sensors and using ML models to find the drones cheaply and increase the coverage. (Radars are expensive and easy to hit because they emit).

What they achieved is a "sensor fusion like" distributed system buid on cheap components and updated realtime. And all this is battle tested in the new environment of transparent battlefield (there is always a drone looking).

Also a lot of real-life electronic warfare stuff and drone applications.

This is what's missing in the US army. They are optimized for a symetrical 20th century warfare.

UKR = entire country of +40m is on the battlefront so they can do total war mobilized homefront distributed system... so can Iran. But it's very different for force projecting security guarantor US - can't convince paying protectorates to pivot total war defense posture in peacetime, that's what they bribe US not to do.

And ultimately whatever model of distributed lethality / survivability (which US planning foresaw) is less relevant that US global commitments requires high end hardware that has to be rotated / propositioned selectively, and sustainable only in limited numbers vs adversaries mobilized on total war.

But the fundamental problem is US adversaries are catching up on precision strike complex. Iran isn't asymmetric warfare, but restoration of symmetry. It's not so much US getting weaker as adversaries getting stronger, and without monopoly over mass precision strike (which naval / air superiority / supremacy is only delivery platform), US expeditionary mode simply on the losing side of many local attrition scenarios. Ultimately all US adversaries will gain commoditized local precision strike (even deadlier if bundled with high end ISR), at varying scales due to proliferation requiring persistence across global theatres US simply doesn't have numbers/logistics for.

TLDR: US expeditionary model is bunch of goons with rifles in trucks, driving around neighbourhood where everyone had knives that could not get in range. The second everyone else buys guns, then rifles, the expeditionary model breaks.