Well the machine gun was discussed here at the time, and by now PSC have updated the review accordingly. It is a copy of the Lewis gun.

The tall mortar was used from 1941 on with 110 being made. The model's barrel should be shortened.
http://www3.plala.or.jp/takihome/mortar.htm

Another convincing PSC review, and despite the criticism I will buy at least one set, as happily these fellows are not much too tall for WW2 Japanese. Regards, Pa

See the Handbook On Japanese Military Forces 1944:

Type 92 MG

Mortars