River Rain complete built lowers all start out as one of our premium forged Stripped Lower Receivers. From there we only up the ante. With nine models of combat ready built M16 series lower receivers there is something to appeal to everyone!
We only have between one and four of each built model. These will sell out fast! We will not have more in stock until very late 2022.
Built Lower Receiver Model Lineup
Mil. Spec. Variants
Enhanced Variants:
To Purchase – Click HERE
Our Built Lower Receivers Start Out As Premium Stripped Lowers
- River Rain Premium M16 Series Forged Lower Receiver
- 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
Mil. Spec. Lower Receivers
