This ATI stripped upper receiver uses the same metal-reinforced polymer construction as ATI's complete rifles, giving builders forged-aluminum durability at roughly half the weight of a traditional upper. It's built around a multi-caliber insert system so one receiver can be configured for .22 LR, 5.56 NATO/.223 Rem, .300 BLK, or 6.8 SPC builds. The flat-top design is optics-ready and uses standard Mil-Spec takedown pins for drop-in compatibility with existing AR platforms.
- Type : stripped AR-15 upper receiver (no bolt carrier group or charging handle included)
- Caliber Compatibility : multi-caliber insert system — .22 LR, 5.56 NATO/.223 Rem, .300 BLK, 6.8 SPC
- Material : metal-reinforced polymer
- Weight : approx. 0.5 lb (receiver only)
- Color : Sniper Grey
- Rail : flat-top, optics-ready
- Compatibility : standard Mil-Spec takedown pins
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