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Rickey,yes it will accept 30rd Magazines. 45 Caliber are fat rounds so only 13rd would fit a 30rd magazine. Some details here : https://www.snipercountry.com/450-bushmaster-magazines/

Rickey, Yes, You can use any AR 15 magazine. 10, 20, 30, 40 round magazine. Put that is for 5.56 rounds. you will get less the half the 5.56 capacity with the 450 Bushy.