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590A1 20" Barrel Standoff Add On?

Just wondering what the best standoff is for my 590A1 with 20" barrel?

At first I was thinking of the Black Aces Spike (because I have the Black Aces Quad Rail), but not sure if a standoff would be more useful. The spike certainly looks cool!

HFD2 looks half decent, but was wanting to know if there is anything better.

Thanks guys!
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So I emailed HFD2 and I had a very quick reply saying that their C-M12-HU model would be ideal for my 590A1 with a 20" barrel, but unfortunately they do not ship to Canada. So I am back at square 1.

Any comments would be appreciated. Thank you.