Reformation® RS11™ Upper Receiver

5+ Weeks
Current Stock:

The Reformation® truly redefining upper receiver group as it has the same benefits as the full Reformation® Firearm! Short Barreled, Non-NFA, No Tax Stamp, No ATF Waiting period, and able to be equipped with a shoulder stock and forward vertical grip!

Current Lead Time 5+ Weeks



  • .300 Blackout Or 5.56 NATO
  • 11.5” Barrel
  • 0 x 0 Twist
  • Patented Straight cut lands and grooves
  • Triumvir™ Flash hider
  • 11.5” FST™ Handguard – M-Lok compatible
  • SBN Bolt carrier group
  • Mil-spec Charging handle
  • Mil-spec upper receiver with forward assist


*Only for installation to a Milspec AR lower with a shoulder stock installed.

*All State and Federal Regulations Apply.

*While ATF will allow consumers to build their own Reformation® firearm by buying our upper and installing it on their lower receiver, we cannot ship an upper and lower on the same date due to excise tax regulations. 

*Any order with a Reformation upper and a built lower receiver will not be shipped.



⚠️WARNING: This product can expose you to chemicals including lead, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to -