Features:
M4 Feedramps
.250 takedown pin holes
Comes stripped, with NO dust cover
M4E1 Specific Details:
Handguard mounting platform is forged into the receiver
These uppers are not piston-kit compatible
The Stern Defense SD Mod 5 9mm Upper Receivers are unique with handguards that extend beyond the end of the barrels. The 8.5” barreled upper has a 10” M-LOK free float handguard, and the 6” barreled upper has an 8” M-LOK free float handguard.
NOTE: This part features a colored anodized finish. These finishes are held to different aesthetic standards than parts finished in black anodizing or Cerakote. For more information on colored anodizing visit our Knowledge Center.
NOTE: This part features a colored anodized finish. These finishes are held to different aesthetic standards than parts finished in black anodizing or Cerakote.