Buildcraft Core 7.1.22 is a release file of the Minecraft mod BuildCraft|Core, made for Minecraft 1.7.10. It was published on May 30, 2017 and is 0.9 MB in size. For the full description, screenshots and every other version, visit the BuildCraft|Core mod page.
How to install: Put the .jar into the mods folder (.minecraft/mods) and start Minecraft with the matching mod loader profile.