Franklin Armory 00-20018-BLK: This design incorporates integrated ambidextrous, anti-rotational Quick Detach sling mounts. On the magwell, forward of the trigger is a textured Memory Index Point for safely resting the trigger finger when not ready to fire. The magazine well is also enlarged and beveled to facilitate quicker magazine changes. The integral trigger guard is over-sized to allow room for larger hands or gloves. The front of the magazine well is also textured to allow it to be used as a grip for forward support. These Built Lower Receivers come with a carbine length, 6-position collapsible stock buffer tube with a B5 Sopmod stock installed. Lower Receiver:Franklin ArmoryA(R) LibertasA(R) Proprietary Billet Lower ReceiverMachined From 7075-T6 AluminumHard Coat Type III Anodized Black, Desert Smoke(TM), or Olive Drab GreenFlared Magazine Well for Quick Magazine ChangesAmbidextrous Push Button QD Sling MountsIntegral Cold Weather Trigger GuardSerrated Memory Index Point for Shooting FingerTextured Front Area for Offhand GripSpecialized Tension Screw - Eliminates Upper/Lower PlayFranklin ArmoryA(R) Binary Firing SystemA(R)Ergo Ambi Sure GripMagazine:Magpul Pmag P30Stock:B5 SOPMOD StockSix Position Receiver Extension InstalledMILSPEC Diameter