The AK-1 and AK-2 were early prototypes in the development of the AK-47, a well-known assault rifle designed by Mikhail Kalashnikov. Here are the main differences between these two prototypes:

1. Design and Features:

   • AK-1: The AK-1 was the initial prototype and featured a gas-operated mechanism with a rotating bolt. It was designed to be a simple and reliable weapon, but it had some issues with its firing mechanism and overall reliability.
   • AK-2: The AK-2 was an improved version of the AK-1. It incorporated feedback and testing results from the AK-1 to enhance reliability and performance. The AK-2 had modifications in its gas system and bolt design to address the issues found in the AK-1.

2. Testing and Evaluation:

   • The AK-1 underwent initial testing, which revealed several mechanical issues that needed to be addressed. These issues included problems with the firing mechanism and the overall durability of the weapon.
   • The AK-2 was developed as a response to these issues, with improvements aimed at increasing the weapon's reliability and ease of use. It underwent further testing and evaluation, which eventually led to the development of the final AK-47 design.

3. Development Process:

   • The transition from AK-1 to AK-2 was part of an iterative design process. The feedback from the AK-1's performance in trials was crucial in shaping the changes made in the AK-2. This process exemplifies the trial-and-error approach often used in weapon development to refine and perfect a design.

These prototypes were critical steps in the evolution of the AK-47, which became one of the most widely used and recognized assault rifles in the world. The improvements made from the AK-1 to the AK-2 were essential in achieving the reliability and effectiveness that the AK-47 is known for.