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The B-25U Rail is designed to attach grips at a 45° angle, including RK-0, RK-1, RK-2, RK-4, and RK-6.
The most popular configuration includes pairing the RK-2 with PKM and PKP machine guns alongside the B-50 handguard.
Note: Not compatible with grips designed for Basis rails (e.g., RK-0L, RK-1L, RK-2L, RK-4L, RK-6L, RL-1).