The monument to the 2nd Company of Massachusetts Sharpshooters is south of Gettysburg on the south side of the Loop of Sickles Avenue. (39.797014° N, 77.246365° W; Google map; Monument map: Sickles Ave. at the Rose Woods)
Originally formed for Colonel Hiram Berdan’s sharpshooter regiments, the two companies of Massachusetts sharpshooters remained as state troops when told that they would lose the state enlistment bounty by joining Berdan’s Federal regiments.
The two companies of Sharp Shooters were nominally independent, although each operated with a Massachusetts regiment. The 2nd Company operated with the 22nd Massachusetts Regiment.
From the monument:
July 2nd 1863,
2nd Co. Andrew
See more on the history of the 2nd Company of Massachusetts Sharp Shooters in the Civil War
The Massachusetts Andrew Sharpshooters: