One of the most popular inexpensive air guns around is the Chinese-made QB-78, a clone of a classic Crosman design, the 160. The original QB-78s were kind of crude, but later models have been better made, and ever since Crosman finally discontinued the 160 there’s been a big demand for the Chinese clone.
The gun is popular enough that a regular cottage industry has emerged in custom and replacement parts for this gun, and recently I came across Archer Air Guns, who offer a wide range of QB-8 parts, including stocks, valve and trigger upgrades, custom barrels in various calibers and more. MOst are factory alternatives designed for the QB-78 and other guns from the same maker. You can see the various parts they offer by clicking here
If you’re interested in a custom stock for your gun, D&H Woodcrafters offers finished and unfinished stocks in various woods and styles. And if you’d like someone else to tune the gun for you, there are many tuners like Charlie Pitts, aka “Charlie da Tuna”, who can get your QB78 shooting up to its full potential.
My own QB-78 has been sitting in a corner of the basement for a few years. Maybe I’ll make tuning and customizing it a summer project.