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Er spricht schlechtes Deutsch...
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Finally something new--433/437 (.300 Blackout version of the 433) will be the subject of a mag article on All4Shooters. Preview pic showing size of the 437 SBR next to a MP5 SD:

View attachment 282642

Also note altered controls and what appears to be a new pattern of bolt catch/release.
Does that mag well look long enough for .300 BO to you?
 

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Premium Member
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294 Posts
I thought that .300 Blackout was based off of/intended to have the same OAL as .223/5.56mm NATO?

Better quality pic of the 437 9" SBR vs MP5 SD:

282795
 
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