Ruger - Duramag USGI 300 Blackout Magblock 10/30 (10 & 15 Round Magazine Capacity Limiter)

- Fits USGI Ruger Branded made by Duramag 30 round magazines in 300 AAC Blackout (7.62x25)
- This block will attach to the bottom of the spring.
- Will convert a 30 round (300 AAC Blackout) magazine to hold only 10 rounds.
- Magazines can be loaded with the bolt closed in most rifles. Fitting may be required in some cases.
- Does not affect reliability.
- No increase in spring pressure. 
-Installs at the base of the magazine.

-This block will also work if you're running 5.56/.223 ammo and block the magazine to 10-rounds.

*ATTENTION: This posting is for the Magblock (only) and not for the magazine. We don't currently sell any magazines at all.