Not really no, you can stop small rounds with light armor, but heavier rounds require extensive armor. Several inches of plate quickly adds up. The amount of energy it requires to move silently, and fast is pretty high. Batteries aren't really capable of even just the motion for more then a few minutes. Gasoline engines are load and leave traces in the atmosphere that make them easy to track. The computer systems needed to run the AI are also quite extensive and using radio signals will leave locate them immediately. There are a ton of barriers. No pun intended. There is also just the fact that your 200,000 robot can be taken out by a round that cost a few dollars by a human who is 1000 to a 1,000,000x more energy efficient and harder to detect with some basic gear, like an IR blocking poncho. Humans are made by nature to be stealthy and efficient and excellent killing machines, robots or otherwise.

This is why the AI doomsayers annoy me so much, we are far away from that being a reality anytime soon, while the real dangers if AI are already here and being abused. Propaganda, fake news, vote manipulation, automated harassment, and artificial intelligence for politicians to learn about things they never could learn with their own miserable little brains. AI is being used for censorship, to brainwash people, and has been for many years and yet we are flooded with the endless distractions about an AI apocalypse to stear the conversation away from the actual bad that is being done today with them.