Butler Creek ASAP Magazine Loader Universal Double Stack 380 ACP to 45 ACPThe ASAP Universal Double Stack Magazine loader works with a large majority of double stack magazines between . 380 ACP . 45 ACP. Fill magazines with one action push the mag loader down, insert the round below the feed lips, and raise the loader up. Bullet seated, magazine loaded. Just like that. Works with most double stack magazines Uses only one action to load magazine