This is a Magpul Industries Tee Shirt, model MAG1114.
Magpul creates products and believe in a lifestyle where everyone is prepared to perform their best" no matter the situation. That is called having the Unfair Advantage.
Features:
4.3 oz 100% combed ring-spun cotton
Crew neck with set-in sleeves
Comfortable, tag-less interior neck label
Shoulder to shoulder neck tape
Double-needle stitching on hems and sleeves for durability