They're great! Matrix Arms has the best upper and lower receiver matches in the country and in the world for that matter and the customer service is top-notch can't be beat. If you ever think about replacing the old contents of your safe like I did with worthwhile parts, then MATRIX ARMS is the way to go! ...without breaking the bank. Hasta la vista, baby!
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Matrix Arms is an established family owned and operated high precision CNC firearm manufacturer located in “Live Free or Die” New Hampshire, USA.
