Assertion: stanag magazine | /r/HasProperty | 40 round box magazines
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Source sentences:
text: The standard STANAG magazines are 20, 30, and 40 round box magazines, but there are many other designs available with capacities ranging from 1 round to 60 and 100 round casket magazines, 90 round snail-drum magazines, and 100 round and 150 round double-drum magazines.