its a redesigned M4 system done by H&K
designed to be better in every way shape and form (except the price tag) while still using standard STANAG magazines (or the HK high reliability mags)
although you can buy the realsteel gun as a whole, you could also buy the upper reciever by itself which holds all the upgraded bits and pieces, but it costs as much as your real steel M4.
the airsoft version made by VFC from what ive seen is solid, but the stock wobbles a bit and the gearbox is a custom V2 meaning you cant get a replacement shell if it breaks
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