Did you register the can when you got it? Silencerco was offering a free muzzle device at one point if you registered a new QD rifle can; it was an online thing and very easy. Also, 54-17 Arms has them on his website for well under MSRP and Jason is a good guy to deal with. Did my last 4 NFA transfers through him and won't use anyone else.
Yes I did register it with SilencerCo... They send you a flash hider for a ..30 cal thus not fitting the Ar15.
54-17 : I do like the business I have purchased from him before (Not NFA). I am applicable for SilencerCo's SPEQ program and it is very hard to beat those prices (He came very close)
SilencerCo did 60% off last years Black Friday accessories. Hopefully they will do the same this year.