This is a Samson Manufacturing Corp. Accessory known as the Rail Section, model ML-2-KIT.
Samson M-LOK Accessory Rails are precision machined to 1913 Picatinny spec to allow mounted accessories a seamless attachment to the handguard. All Samson M-LOK Accessory Rails are designed per M-LOK spec and feature a beveled end to provide a smooth transition to the handguard. Accessory rails include all necessary hardware for mounting to M-LOK slots and are a great addition to any M-LOK version of Samson handguard. This is the 2" Accessory rail kit. Includes two rails.
Features:
Samson M-LOK 2: Rail Kit
Includes 2 rails