The RB9M adapter permits a use of SIG P320 magazines in Ruger PC Carbine. It is similar to the traditional RA9M, but is re-designed to employ a heavy duty material (PA12+CF40).
For left side (factory default) magazine release location only - not reversible.
The RB9B works in either original factory chassis or in Magpul Backpacker. It is advisable to use a flat bottom release button in the factory chassis. A basic button is included for your convenience.
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