The origin of the name is unknown. It perhaps derives from the German büchse, for gun, or the Dutch bus for barrel (hence blunderbuss) or maybe from the colour of the walnut woodwork.
Stress-bearing parts such as the barrel, lockwork, ramrod and sling-swivels were made of iron; the other parts such as the butt plate, trigger guard and ramrod pipe were brass. It weighed around 10 pounds. It could be fitted with a 17-inch triangular cross-section bayonet.
It went through numerous variations and modifications over its long history. The first common version was the Long Land Pattern of 1730, 62 inches long with a 49 inch barrel. It was eventually discovered that shortening the barrel did not detract from its accuracy (which was extremely poor anyway), but was easier for soldiers to manage. This resulted in the Militia (or Marine) Pattern of 1756 and the Short Land Pattern of 1768, both of which had a 42 inch barrel.
A cheaper version with a 39 inch barrel was manufactured for the British East India Company, and eventually adopted by the British Army in 1790 as the India Pattern.