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Hi Richard, the magazine is detachable 10rd. This is a competition model. (A1 Competition). ---- MR556 Competition Model, fourteen" Modular Rail System handguard, Operator Suppressor Systems muzzle compensator, Magpul CTR 6-position light weight telescoping buttstock, pistol grip, Picatinny rail on upper, extended magazine release, no sights and supplied with one polymer magazine. Ambidextrous safety lever.

Description is pretty clear. 10+1 meaning it meets Ca. Regulations!!

An extended magazine release is also included for quick magazine changes. They are detachable.