[quote=@Gunther]
I changed SFC Park's primary weapon from an HK416 to an FN SCAR-L since according to HeySeuss' timeline in this RP, Heckler & Koch are now producing firearms for the Warsaw Pact rather than NATO.
[/quote]

Yeah, pretty sure Heckler and Koch weaponry show up in the GDR arsenal. Odds are, so does the MG3. The 416 was designed with input by Larry Vickers, so I think that it's possible that another company worked up the concept. There's a bunch of them producing M4 type weapons with pistons or rotating bolts rather than direct impingement, so such a thing is possible.