You'll save some cash if you buy the upper and lower seperate 
16" is the shortest legal barrel without paying the SBR tax.
Get it chambered for 5.56 so you can shoot both .223 and 5.56.
Get a basic M4 and add your own goodies
16" is the shortest legal barrel without paying the SBR tax.
Get it chambered for 5.56 so you can shoot both .223 and 5.56.
Get a basic M4 and add your own goodies