https://midstatefirearms.com/product/15-slanted-hybrid-m-lok-free-float-rail/

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Slim hybrid M-Lok free float rail for the Ar15. Slanted Front

• M-lok design, holes 3/6/9 o’clock on sides and bottom
• Fixed Picatinny rails at 3,6,9 o’clock positions near front
• Smooth middle, ergonomic grip. 
• Uniform barrel nut, no timing required for easy alignment.
• weight: approx. 14oz 
• Barrel nut included