This would be the description from the website
50 Beowulf® Entry - Complete Upper Assembly
Flat-top receiver, 16.5" chrome moly barrel, 1:20 twist rate, standard A2-type two-piece handguard, and standard Picatinny railed gas block. Direct impingement operating system. Ships with one 7-round magazine. This unit is 100% complete and is compatible with any standard-specification lower receiver (no modifications required). Weight of upper is 4.45 lbs.
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