Falx by ShoelessHistorian

Falx is one of the few open-source sheet metal blasters. Capable of an fps range of 160-275+ with standard tuning, this is a sturdy and accurate blaster. Designed from the ground up to be one of the best in class options for this FPS range. 

Hardware only - All hardware needed. Includes anodized sheet metal panels, your selection between two high-quality 45CM barrels, 8 inch K25 spring, a highly durable TPU ram (printed in black), and all other hardware needed for the build.

DIY and Pre-Built to come in the next few days. 

NOTE: 12.8mm barrels are the intended standard for Falx. 13mm are available for circumstances where dart compatibility might be a problem with tight barrels, such as high-humidity areas. 13mm will be more versatile, and 12.8mm will have notably better performance in optimal conditions. Please choose accordingly to your needs.

https://www.printables.com/model/1412614-flp-08-falx-sheet-metalprinted-nerf-blaster