M16 Series Stripped Lower Receivers

River Rain LLC is proud to present our own M-16 series lower receivers!

WE ARE CURRENTLY SOLD OUT OF ALL STRIPPED LOWERS!

We do not anticipate that we will have more in stock until 4th quarter 2022! Be sure to check out our Built Lower Receivers!

Stripped Lower Receiver Model Lineup

  1. M16A1
  2. M16A2
  3. M16A4
  4. M4 CARBINE
  5. M4A1 CARBINE
  6. MK18 CQBR

To Purchase – Click HERE

  • M16 cut fire control pocket. (Ready for an SOT to drill the “third hole” or a DIAS)
  • Lower receivers are made here in the USA by American men and women
  • Manufactured to Mil. Spec. on state of the art CNC equipment for consistent quality parts and exacting tolerances
  • Lowers are machined from 7075-T6 forged aircraft grade aluminum
  • Coating is matte black hard coat anodized Mil 8625 Type 3 Class 2
  • Take down pin spring and detent hole is threaded for a 6-32 set screw for easy capturing (hardware not included)
  • Mil. Spec. 0.250″ Take Down Pin Hole Size
  • Upper tension screw 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 model: e.g. SAFE-SEMI-BURST or AUTO
  • Save money by building your AR-15 from the ground up, weather it is “clone correct” or you just want something a bit more personalized