This rifle length SPR Straight top rail is a full Picatinny rail that connects the receiver to the forearm. This top requires the 8.5" rail with lugs in order to connect top rail to forearm. This creates a rigid platform ideal for mounting accessories. This top rail works with both the Gen II round forearms as well as the Octagonal forearm with M-LOK.

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One question we get from customers is What's the difference between a Mark 12 Mod 0 Gen II and Gen III? Here's our answer.

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