AR15 Commercial Comparison Chart .....different manufacturers

Not all 6920's have the M16 BCG, earlier units have the half-circle type with an unshrouded firing pin. My 6920 also has a carbine buffer.
 
How about the specs of lower receivers ? are they all similar with respect to forging/hole position & diameter/finish/QC ?

With the DPMS stripped lowers currently on sale at Questar, was thinking of getting one for a new 9mm build... is it worth trying out ? or should i just put 30-70 $ more for higher quality lower ?
 
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