I have ordered from Mas Defense a number of times and this time is no different. Great products at great prices is the best way to describe this company. This 9mm upper is a quality product with no defects that I can find and the fit and finish are superb on my 80% lower. I also purchased a Echo bolt for this build and I'll be changing the bird cage out for a more aggressive one. I have built over 15 rifles to date and many carry parts from Mas defense.
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