Number 2 takes the mg13 / pzb39/ Mg34 style bipod but it’s not for Mg34. 9 is very close to the Mg34 sear but it’s not. 1 and 8 are also ww2 German WaA4 is BSW, it’s post 1937 iirc because before that it was the downswept wing Weimar Eagle.
# 2 looks like an adapter for an MG34 bipod but I'm not sure what for. It looks too small for the 34 jacket so maybe its for an MG15 or something. # 7 is the gas adjuster for a jap type 96 or 99 LMG I think. Tough to tell from the pics.
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