Curious whats go to hop up

M4a1 Gen 9 what hop up are people using ??

Rizer hop up or DK J9 hop up

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Curious do these both fit well under a suppressor and could you recommend any suppressors ?? Cheers

Rizer hop up got 13mm OD or 16mm OD , so they can fit inside any 19mm suppressors

Dkj9 pretty cheap on eBay, works a charm. Fits under hk suppressor not sure on others.