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PROMAG Ruger Mini 30 Magblock 10/20 Magazine Capacity Limiter

 This block is for use in PROMAG RUGER 20 round Mini 30 magazines. These blocks will insert at the base of the magazine spring and convert a 20 round magazine to hold only 10 rounds.

- Only for use in PROMAG manufactured magazines. 

- Designed to work in the polymer magazine only.