A good look at the Systema PTW Infinity NBORDE XM177E2 Complete Model by Mister Moro, in this Hyperdouraku review... "A video review of ystema PTW Infinity, a complete model that incorporates NBORDE's custom receiver for PTW, XM177E2. The large flash hider is a major feature of the XM177E2. The barrel is 11.5 inches. It was used in the Vietnam War as a precursor to carbines for US special forces such as SEALs and Green Berets."
Have good look at the Systema Engineering Infinity PTW that is kitted with the NBORDE machined receiver set in this promotional video from NBORDE... "This video is an image video of SYSTEMA INFINITY newly developed in 2021. Most of the airsoft guns that appear are equipped with the NBORDE total machined receiver set."
Hyperdouraku announced the the NBORDE XM177E2 PTW Infinity conversion kit will be released in Spring 2022. The prototupe is 3D-printed but it will eventually become a machined aluminum receiver. The real size receiver measured and scanned from a real gun is the ultimate XM.
Read more here and watch the overview video here.
For Systema PTW owners who want to change their receivers with a set that has the Colt Defense markings, Hyperdouraku writes about the NBorde Custom M4 PTW Receiver. This is a milled upper and receiver set, Milspec hard-anodized and the markings fully etched.