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Here's the item you were looking at:

FGC68: FGC9 MKII AR buffer tube thread in model replica for paintball
this model is based on the FGC9 AR buffer-tube mount
https://www.printables.com/model/192633-unw-fgc9-fgc6-mkii-or-mki-thread-in-ar-buffer-tube
but y
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