Nerf Rival Back-Compat Adapter
thingiverse
I'm combining @guohc's Nerf Rail Adapter and @kaiyote's Nerf Rival Tactical Rail. My son got a Nerf Rival accessory by mistake but couldn't use it with his Nerf Elite due to a new rail type. Now, he can attach any Rival accessory to all his other Nerf guns. Updated 2017-08-04: I added a small nubbin on the older tactical rail so it doesn't slide off. The Rival side of the rail is now about 1mm wider for a better fit with attachments. I also made a "no overhang" version if your Rival attachment doesn't need gaps.
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