The highest capacity magazines that we carry for MP5s are 50-round drums from Magpul and ProMag.
HK MP5 Magazines
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Frequently asked questions about HK MP5 Magazines
What is the highest capacity magazine for an MP5?
What is the standard capacity of an MP5?
The classic HK MP5 has a standard 30-round capacity.
What caliber does the MP5 shoot?
The standard MP5 is chambered in 9mm, but several other caliber offerings can be found.