Monolithic top rail
<br />Keymod cutouts for easy install of your favorite accesories
<br />lightweight forend
<br />Barrel nut inside hole diameter: 1 in (25.4mm)
<br />Barrel nut outside diameter: 1.35 in (34.4 mm)
<br />Barrel nut mounting thread spec.: 1-1/4-18 UNC