The River Rain LLC M4A1 CARBINE Mil. Spec. Built Lower Receiver
- River Rain Premium M16 Series Forged Lower Receiver consisting of:
- River Rain “Cloud” logo
- M16 cut fire control pocket. (Ready for an SOT to drill the “third hole” and convert to a “post sample” or a DIAS)
- Lowers are machined from 7075-T6 forged aircraft grade aluminum
- Coating is matte black hard coat anodized Mil 8625 Type 3 Class 2
- Upper tension screw hole behind grip screw (threaded hole) to adjust any “slop” out of vertical fit between upper and lower (hardware not included)
- Caliber marking of “5.56 MM” but can be used with many different caliber uppers (300 blackout, 9mm, etc.)
- Compatible with all Mil. Spec. AR-15 components and magazines
- Safety selector markings accurate to the M4A1: SAFE-SEMI-AUTO
- Geissele SSA two stage trigger
- Seekins (Or B5) billet trigger guard
- Seekins (standard throw) Or (Armaspec SFT 45/90) ambi safety selector
- Seekins enhanced bolt catch
- Seekins magazine release button
- B5 Systems Enhanced SOPMOD buttstock (six position)
- Flat wire buffer spring
- H2 buffer
- QD end plate
- Magpul MIAD 1.1 pistol grip
- YHM EZ Pull Take Down Pins
