AR15 UPPER RECEIVERS
Gorilla Machining offers a huge selection of AR-15 upper receiver parts. If you're building a new AR-15 or upgrading or replacing some old parts we have plenty of options to choose from such as accessories, barrels, barrel assemblies, bolt carrier groups, charging handles, gas blocks, handguards, rails, conversion kits, muzzles, grips, sights, & much more.
- GORILLA AR-15/M4/M16 300 BLK OUT AAC UPPER RECEIVER
- GORILLA AR-15/M4/M16 9MM LUGER UPPER RECEIVER
- GORILLA AR-15/M4/M16 MARKSMAN 5.56/.223 UPPER RECEIVER