The R&D director of Bravo Company is trying out the WPA T91 piston upper on his BCM testing lower. The T91 piston upper functioned flawlessly with various type of ammo: cheap steel-case Tula, commercial brass case Fiocchi 55.gr, military pressure WPA Gold 55gr (made by by the same Taiwanese arsenal that makes the T91) to NATO green-tip M855 62 gr.
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