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https://twitter.com/JakOSpades/status/1775779044841197614The Arbel system exists in two forms: a lower receiver for the Arad (and other AR pattern rifles) and a pistol grip module for the Negev family of MGs.

https://twitter.com/TheDeadDistrict/status/1627959692763836416How ? Well first of all here is a short primer on the fundamentals of how ERA works by @JonHawkes275
https://twitter.com/JonHawkes275/status/1372118140046413826?s=20
The traditional rear AK sight, or the 2nd Gen diopter, have been replaced by a flip-up aperture. A 'П' battle sight (0.5 - 200 m, with additional night sight) and 600 m apertures are available. The 🇫🇮 and 🇮🇱 did this decades ago... 

It took the 🇳🇱 almost 4 years to qualify the M6C, with deliveries of 155 weapons having taken place in 2015. Ammunition qualification was completed in 2018, with the DMO granting full qualification for use with the Army, Marines and SF in early 2019. Why so long ?
The launcher is the same as the RPO-A (marked with a red cross on the end caps), but inside, they are very different. The RPO fires a fin stabilised projectile filled with thermobaric, incendiary or smoke producing mixtures. The SPO houses a canister with a fixed launch motor. 

The production model (left) now has a continuous length M-LOK interface on the underside, and the profile of the upper portion has been tweaked. The prodution XM250 has lost its side folding stock capability, due to the necessesity of a battery pack for the powered rail.