This photographs was posted on the U.S. Department of Defense Media Activity’s public domain website DVIDS along with another one featured on Silah Report. Both depict improvised suppressors captured by U.S. Infantrymen while on operations in Iraq.
The rifle appears to be a Mauser 98K with the stock sawed off just past the chamber. Because of the proximity to Iran and the incredible amount of Iranian surplus found in Iraq, it would appear from conjecture that this rifle is a Persian Mauser, manufactured in the time of the Shah in the 1940s-50s, later being replaced by the M1 Garand through U.S. Foreign Military Sales programs in the 1960s. Unlike the previous M16A1 rifle we posted about, this improvised suppressor appears to have involved much more work, with a much larger diameter pipe being welded around the actual barrel of the rifle at both the front and rear of the pipe. There is a section of much smaller diameter pipe protruding from the main one, but this doesn’t appear to be the barrel.
The scope mounted on this rifle is a Cold War era PSO-1 optic designed to mount on the optics rails usually riveted to the left side of a Kalashnikov or Dragunov receiver. It is unclear how this is mounted to the Mauser’s wood stock, unless an actual Warsaw Pact rail were somehow screwed into the wood stock itself.