This explains much of the Sako's design.
PSR solicitation requirements:
On January 15, ’09 SOCOM re*leased its requirements for a new PSR (Precision Sniper Rifle) for future fielding with our nation’s special operations forces. It seems that Uncle Sam has finally embraced the idea that the 7.62mm doesn’t have the legs for our current operational environment and at 27 pounds (unloaded) a .50 cal can only be carried so far so fast by one soldier. In an effort to reach out farther than a 7.62mm rifle allows while keeping the weight reasonable for one soldier to carry, SOCOM has introduced the PSR program.
The future PSR must have a stock that either collapses, folds or removes without tools. It must also have no component longer than 40 inches and weigh less than 18 pounds with a loaded five-round magazine. Mil Std 1913 rails are required and the barrel must be changeable by the operator within 20 minutes. There is no specified caliber.
PSR Solicitation For SOCOM
The accuracy requirements bear close scrutiny. All accuracy measurements will be taken at 1,500 meters. Yes, you read that right. In a stroke of genius, SOCOM will take all accuracy measurements at the range of operational employment of the PSR. Ten-round groups will be measured for vertical dispersion only, negating variable wind effects.