OTM Mags are magazine attachments for the DR-H in Call of Duty: Mobile. The OTM Mags have two round types, those being 25 rounds and 30 rounds.
25 Round OTM Mag[]
The attachment increases the DR-H's overall damage, a departure from the FMJ attachment featured in various games throughout the series, which it is similar to. While the latter merely allowed the user to penetrate walls more easily, the OTM actually increases the weapon damage.
30 Round OTM Mag[]
The 30 Round OTM Mag is the extended version of the 25 Round OTM Mag. It was introduced during Season 12 and has increased body part damage however at a cost of the Aim Down Sight time and movement speed.