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BackSlotMinecraft mod for 1.21.1

Keep your weapon always ready

client and servernewest supported release 1.21.1EquipmentGame Mechanics
Latest version
1.3.1+1.21.1
Minecraft
1.19.2 to 1.21.1
Java
Java 21+
Loader
Fabric
Licence
GPL-3.0-only
Downloads
1.8M
Updated
2 mo ago
Available on
Modrinth
Space NodeOur hosting

Host BackSlot servers

One click and BackSlot is installed with the right loader, on hardware built for it.

  • 1.21.1
  • Fabric
  • One click mod install
  • Loader matched for you
  • Ryzen CPUs
  • NVMe SSD
Deploy a serverFrom €0.90 per GB

Minecraft versions

Every version BackSlot declares support for, newest first, with the Java runtime that version needs.

Other mods
MinecraftThroughJavaEvidenceReleased
1.21.1Fabric21+declared8 Aug 2024
1.21Fabric21+declared13 Jun 2024
1.20.6Fabric21+declared29 Apr 2024
1.20.1Fabric17+declared12 Jun 2023
1.20Fabric17+declared2 Jun 2023
1.19.4Fabric17+declared14 Mar 2023
1.19.2Fabric17+declared5 Aug 2022

Download

From BackSlot’s own host. Nothing is re-hosted here.

Most recently published release

1.3.1+1.21.1release15 Sept 2026

backslot-1.3.1.jar · 0.2 MB · for 1.21.1 · Fabric

Download this release
19843602225f…
Older versions11
  • 1.3.0+1.21.113 Jan 20261.21.10.2 MB13.5k downloadsfc34997b30b4…Get
  • 1.2.16+1.21.119 Nov 20241.21.10.2 MB80.8k downloadse79bad674893…Get
  • 1.2.15+1.21.110 Sept 20241.21.10.2 MB6.7k downloadsfd6a058e89fa…Get
  • 1.2.15+1.2122 Jun 20241.210.2 MB86.6k downloadsaab08f45e1ad…Get
  • 1.2.15+1.20.610 May 20241.20.60.2 MB5.5k downloads99351bb849c2…Get
  • 1.2.15+1.20.114 Sept 20231.20.10.1 MB1.4M downloadsbc44b0215bff…Get
  • 1.2.14+1.20.116 Aug 20231.20.10.1 MB3.6k downloads59cc07d78fc8…Get
  • 1.2.13+1.20.121 Jul 20231.20.10.1 MB1.3k downloads47d2cdae67a3…Get
  • 1.2.13+1.209 Jun 20231.200.1 MB8.1k downloads87e8d5b0034f…Get
  • 1.2.13+1.19.418 May 20231.19.40.1 MB1.9k downloadsb7ab5d1ca2c3…Get
  • 1.2.1119 Apr 20231.19.20.1 MB50.4k downloads59a8ea0c7566…Get

Dependencies

What BackSlotdeclares it needs, from the author’s own release metadata. A required one has to be installed alongside it or it will not load.

Fabric APIRequired. Lightweight and modular API providing common hooks and intercompatibility measures utilized by mods using the Fabric toolchain.Cloth Config APIRequired. Configuration Library for Minecraft Mods

Frequently asked

Does BackSlot work on Minecraft 1.21.1?

Yes. 1.21.1 is the newest Minecraft version BackSlot declares support for, and the claim comes from the author's own release metadata rather than from a compatibility list somebody maintains by hand.

Which Minecraft versions does BackSlot support?

Everything the author has declared, from 1.19.2 up to 1.21.1. The full list is in the table above, with the Java runtime each version needs next to it.

Do I need to install BackSlot on the client or the server?

Both. Every player needs it installed and so does the server, so anyone joining without it will be refused.

Which platform or loader does BackSlot support?

Fabric. A build for one platform or loader will not necessarily load on another, so this is the first thing to check before the Minecraft version.

Which Java version do I need for BackSlot?

Among the supported Minecraft releases above, the highest recorded requirement is Java 21 or newer. Use the requirement for the exact Minecraft version you run; previews and snapshots may differ.

What does BackSlot need to run?

It declares Fabric API and Cloth Config API as required, so those have to be installed alongside it or it will not load. Each one is linked in the dependencies section above.

What licence is BackSlot under?

GPL-3.0-only, as stated by the author on the platform we synced it from. Check the project's own page before redistributing or bundling it.

How do I install BackSlot?

Install the matching loader first, then put the downloaded file in your mods folder and start the game. The loader, the mod and Minecraft all have to be on the same version, which is the usual reason a mod does not appear in game.

Where do I download BackSlot safely?

Start with the author's page on Modrinth, which is where the data here is synced from. MCReference does not host or repackage files. When available, recorded download links go to the source for that release; verify the publisher, filename and any available checksum before running it.

Works on the same versions

Ordered by how much of the recent Minecraft version coverage overlaps, not by popularity.

GeckoLibA 3D animation library for entities, blocks, items, armor, and more!Cloth Config API (Fabric/Forge/NeoForge)Config Screen API for MinecraftJourneyMapReal-time map used for mapping in-game or your browser as you explore.Architectury APIAn intermediary api aimed to ease developing multiplatform mods.Jade 🔍Shows information about what you are looking at. (Hwyla/WAILA fork for Minecraft 1.16+)Collective🎓 Collective is a shared library with common code for all of Serilum's mods.

Details from Modrinth, where the author last updated it on 15 Sept 2026. We do not host files or republish descriptions. Available download links point to the author’s own release.

Is this information wrong or missing something? .