The Master Grade (MG) MSN-06S Sinanju (Ver. Ka) is a 1/100 scale kit released in 2013.

The MSN-06S Sinanju (aka Sinanju) is a mobile suit featured in the Mobile Suit Gundam Unicorn novel, its OVA adaptation and the television re-cut. A modified version of the MSN-06S Sinanju Stein, it was piloted by Full Frontal.
Originally the MSN-06S Sinanju Stein developed by Anaheim Electronics as part of the Earth Federation's "UC Project", its movable frame is partly made from Psycho-Frame materials. This mobile suit was then stolen and modified into the MSN-06S Sinanju by the Neo Zeon remnant group known as "The Sleeves", and became the personal machine of the group's leader, Full Frontal.

Read more about the lore of this mobile suit
Read more about this gunpla kit: MG MSN-06S Sinanju (OVA Ver.)
Youtube search of this kit