Master Model is a scale model metal detailing parts manufacturer located in Poland. Their lines include exquisitely detailed photo-etched and white metal replacement parts for aircraft and ships in the most commonly produced scales.
Master has produced replacement cannons of the early type, with uncovered barrels for any 1/72 Hawker Typhoon early Mk Ib kits. This item is intended to completely replace the plastic kit parts. My example kit (a Maquette issue from Russia) is a Mk Ib, and my research indicates it is the correct version that this particular part issue would be appropriate for. These cannons should generally be fitted to the earlier “car door” version of the Mk Ib as used early in WWII by the RAF. Later Mk. IB versions had full cover extensions over the cannon barrels.