Project 628 was a design study, circa 1952-1953, to fit a Vladimir Nikolayevich Chelomei (Влади́мир Никола́евич Челоме́й) sub-sonic cruise missile to the 1,500-ton diesel-electric Soviet XIV series K-Class sub. The Russian Project 628 proposal is similar to what the US Navy did with a ‘Loon’ launching from a Gato Class submarine, the USS Cusk SSG-348. The original K-Class design was approved in 1936 as a long range "cruiser submarine" with a heavy torpedo and gun armament. The boats could operate as a "fleet submarine" working with the battle fleet or as long range commerce raiders. The double hull was divided into seven compartments. It was originally planned to carry a small floatplane for scouting but this concept was abandoned when the planned aircraft proved too flimsy. Twelve submarines were built, although seven of them ended up being trapped in Leningrad by the Germans, and were not finally completed until after the end of the war.

OKB Grigorov, is a Bulgarian scale model designer and manufacturer established in 2003. Their stated goal is to provide quality models and accessories with the maximum amount of details. OKB manufactures resin AFV, ships, and accessories.

From Wikipedia: The T-100 was a Soviet twin-turreted heavy tank prototype, designed in 1938–39 as a possible replacement for the T-35. The T-100 was originally conceived with three turrets and was eventually built with two. The prototype T-100 tank was briefly tested without success alongside other designs in the Soviet invasion of Finland in 1939. It was never put into production due to the archaic design concept, poor mobility, and the availability of a far superior alternative, the KV series.

Scale Aircraft Conversions (SAC) manufactures white metal landing gear that is a direct replacement for the kits plastic landing gear. The metal landing gear offer greater strength over the kit parts as well as having most of the mold lines removed. At times the metal will be bent out of shape but that is easily corrected by bending it back to the correct shape.

This set includes six parts, the main gear struts, two retract arms, one tailwheel trailing link and strut. All the main gear and tailwheel items are exact copies of the kit parts with most of the mold lined cleaned up. The tailwheel kit part has excessive molding flash and that is cleaned up on the SAC version.