7.1.27 is a release file of the Minecraft mod BuildCraft|Builders for Forge, made for Minecraft 1.7.10. It was published on February 26, 2025 and is 0.2 MB in size. For the full description, screenshots and every other version, visit the BuildCraft|Builders mod page.
How to install: Put the .jar into the mods folder (.minecraft/mods) and start Minecraft with the matching mod loader profile.