Christopher, it is definitely Double Action/Single Action. I have 2 of these.

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Hi Christopher, It's DA/SA -- (SPECS): - Taurus Millennium G2 PT111 Semi Automatic Pistol 1111031G212 - 9mm Luger - 3.2" Barrel - 12 Rounds - Compact Polymer Frame - DA/SA - Three Dot adjustable sights - Manual Safety - Taurus Security System (TSS)s - Loaded Chamber Indicator - Accessory Rail - Overall length 6.2" - Overall weight 22 oz - Black.

it is DA/SA other sources may just get tired of typing in full descriptions :(

Its a DA/SA gun specs The Taurus PT111 Millennium G2 is an excellent choice for concealed carry applications. The Taurus PT111 Millennium G2 is packed with features making this an easy to shoot and easy carry pistol. Do a little research and you will see that the Taurus PT111 Millennium G2 is highly touted as being a accurate, reliable, and durable while being offered at a lower price range than some of their competitors. Who says you need to spend an arm and a leg for a reliable carry gun, obviously never picked up a Taurus PT111 Millennium G2!
Specifications and Features:
Taurus Millennium G2 PT111 Semi Automatic Pistol 1111031G212
9mm Luger
3.2" Barrel
12 Rounds
Compact Polymer Frame
DA/SA
Three Dot adjustable sights
Manual Safety
Taurus Security System (TSS)s
Loaded Chamber Indicator
Accessory Rail
Overall length 6.2"
Overall weight 22 oz
Black

Paragraph 6 here explains in detail what's really going on(technical detail wise) - but Taurus knows best : americanrifleman.org/articles/2013/8/26/taurus-pt-111-millennium-g2-9-mm-pistol/

DA/SA Christopher -- (Complete Specifications and Features): - Taurus Millennium G2 PT111 Semi Automatic Pistol 1111031G212 - 9mm Luger - 3.2" Barrel - 12 Rounds - Compact Polymer Frame - DA/SA - Three Dot adjustable sights - Manual Safety - Taurus Security System (TSS)s - Loaded Chamber Indicator - Accessory Rail - Overall length 6.2" - Overall weight 22 oz - Black.