I'm not sure what is meant by "standard" airguns. There is great variability in power and barrel design that affects ability in slug shooting. Now, going with the standard 100 yard accuracy. There are a sizable amount of airguns that will work, however, usually, a modified boost in power is needed to help promote accuracy. Generally, slugs like going faster than pellets. Many guns out of the box are not adjusted for that. Once the gun is adjusted for high power, I've seen FX liners, CZ barrels , LW barrels and polygonal barrels all work. The next critical step is fitting the correct slug for individual barrel. Lastly, adjusting to the correct tune for optimal performance. All this takes work, research, and a ton of patience.