Is this 3D model free to download?

Yes, M4 Airsoft RAS Keymod Rail is free to download from Thingiverse. Open it in the free Thinger app, or use the "Download from Thingiverse" link to open the original listing by the creator.

Where do I download the STL file?

The download is hosted by Thingiverse. Use the "Download from Thingiverse" link on this page to open the original listing and grab the file, or save it to your print queue in the free Thinger app.

Designed by XDr4g0nX, published on Thingiverse. Please credit the creator when sharing your print.

Can I print this at home?

Yes. This is a printable 3D model intended for home FDM and resin printers. Check the original listing for suggested print settings.

M4 Airsoft RAS Keymod Rail

Source: Thingiverse by XDr4g0nX

The M4 Airsoft RAS Keymod Rail is a free printable 3D model from Thingiverse by XDr4g0nX. After playing a couple of games with my M4 AEG I found that the plastic handguards were just not sturdy enough for me and looked a bit too stock. You can download the STL file from the original listing below and print it at home.

Open in Thinger (free) Download from Thingiverse

1,657 saves Source: Thingiverse Updated 2026-10-06

Tags: M4, Airsoft, RAS, Keymod, Rail

About this model

After playing a couple of games with my M4 AEG I found that the plastic handguards were just not sturdy enough for me and looked a bit too stock. I then sat down and took my M4 apart and studied the Delta ring and gas tube connection, after a while of measuring and searching Google for reference images I came up with this 10" RAS Keymod Rail. It attaches right onto the threads on the upper receiver and just screws tight, and it can be held in place with the gas tube. Alternatively you can use a rail riser or optic as I have done in the pictures to keep slight pressure on the rail as not to unscrew (it already is fairly tight). The rail is actually free floating, but I designed a mounted suppressor that screws OVER the outer barrel extension to give extra strength to the rail and keep the i…

Frequently asked questions

Is this 3D model free to download?: Yes. M4 Airsoft RAS Keymod Rail is free to download from Thingiverse. Open it in the free Thinger app, or use the "Download from Thingiverse" link above to open the original listing.
Where is the STL hosted?: The download is hosted by Thingiverse, not by Thinger. We link you directly to the original listing by XDr4g0nX.
Who made this model?: Designed by XDr4g0nX, published on Thingiverse. Please credit the creator when sharing your print online.
Can I print this at home?: Yes. This model is intended for home FDM and resin 3D printers. Check the original listing for suggested print settings like layer height and supports.