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Ordered this one piece receiver from Zimmerman Arms and finally got it out of jail today. The installation was completely bolt on. I got a nice light weight Green Mountain 16" SS Fluted Barrel with Dark Tan 6 position Magpul M4 stock. I also installed a cheap 4-9 x 40 from ehobbysports.com. The total weight without the scope is 4.80 lbs. I was hoping little lighter in the low 4 but Magpul stock is pretty heavy due to better quality than most cheap China made stocks. I have a Sig522 but this is something special because I have choices on the parts I want to put on. Sig 522 is still too heavy to my son, so I made him (Me too 
) this.
) this.
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