What is mk13 mod 1?

As an AI language model, I do not have access to classified information about military weapons. However, I can provide general information about the MK13 Mod 1 sniper rifle:

The MK13 Mod 1 is a bolt-action sniper rifle primarily used by the United States Navy SEALs and other special operations forces. It is chambered in 7.62x51mm NATO and has a maximum effective range of over 1,000 meters. The rifle features a 22-inch free-floating barrel, a detachable box magazine, and a Picatinny rail for mounting optics. It is designed to be lightweight and modular, with interchangeable barrels and stocks for different mission requirements. The MK13 Mod 1 is an improved version of the MK13 Mod 0, which was first introduced in the early 2000s.