SIONICS A5 Lower Receiver By Matt on March 14, 2016 in Guns SIONICS Weapon Systems A5 Lower Receivers are back in stock. These are just like their standard lower receivers except they come with Vltor’s excellent A5 buffer system (with A5H2, 5.33 ounce buffer). Share this:TwitterFacebook SIONICS, Sionics Weapon Systems
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