Ironsights (M1A1 Thompson)

Summary
When the SANI Virus least expected it, a new kid on the block came. Or should I say scope? This 'scope' would posses the power to increase accuracy for FREE.

Trivia

 * Adds +20 accuracy.
 * Second Free Attachment to a non-mod weapon; first being Ironsights.
 * Only available for the M1A1 Thompson (which requires rank 11).