Continuity mistake: When Karl Urban is defending the Asgardians, the dust covers on his rifles vary between being open and closed several times. M16 dust covers are sprung loaded - they open on the first shot and have to be manually closed afterwards.

Thor: Ragnarok (2017)
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Directed by: Taika Waititi
Starring: Cate Blanchett, Benedict Cumberbatch, Idris Elba, Chris Hemsworth, Tom Hiddleston, Tessa Thompson
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Grandmaster: Revolution? How did this happen?
Topaz: Don't know. But the arena's mainframe for the Obedience Disks have been deactivated and the slaves have armed themselves.
Grandmaster: Ooh, ah, I don't like that word.
Topaz: Which? Mainframe?
Grandmaster: No. Why would I not like mainframe? No, the "S" word, the "S" word.
Topaz: Sorry, the prisoners with jobs have armed themselves.
Grandmaster: [Smiles] OK, that's better.
Question: Has anyone counted how many rounds Skurge fires near the end? They seem like regular M16's with only a 30-round magazine in them, and it seems like he shot off more than 60 total rounds. Plus he said he got them from Texas, so it's not like they were enchanted Asgardian weapons. Or do the comics mention anything about earth bound weapons gaining some sort of extended/unlimited ammo capacity that this scene is a nod to?
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Answer: There's no mention in the movie that the weapons have been enchanted or improved so it is probably just the usual heroic movie convention of 'bottomless magazines'.