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I’d say 300 if you want to shot suppressed subs. 300 supers are going to be very similar to x39. 300 is fairly easy to find but will be more expensive than 556. You can never go wrong with 556.
 

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Just do both 5.56 and 300blk at the same time. It would only be a few hundred more for the 300blk barrel, and that would be the only difference needed from 5.56.

300blk is also very easy to get online as well. It’s still a little rare in store front depending on your local, but online is really easy now. It’s still unfortunately around $0.62/rd for the cheap stuff. If you set up a notification, you can occasionally snag it for $0.50/rd.

What length are you going with?


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