[GiterDunn]

- 551 handguard, swiss style top rail, various types of charging handles
Free CAD Designs, Files & 3D Models | The GrabCAD Community Library

- M-lok handguard, prints in 2 parts, attaches to the 556SWAT upper rail and has SWAT rail style bayonet lug and takedown pin brackets.
Free CAD Designs, Files & 3D Models | The GrabCAD Community Library

- solid CAD model of the above rail, in case anybody wants to modify it or try machining one.
sig rail - Google Drive

 

[Omegajb]

I need to get a 3D printer. Thanks for sharing.

 

[LKY13]

Nice! Thank you for sharing these. Ditto on the 3D printer.

 

[GiterDunn]

You're welcome. Look up Ender 3, that's the printer I use. Under $200 and mine has been running 24/7/365 for 3 years.