If you’re looking for your next high-quality AR-15 rifle build, then a Sons of Liberty M4-89 barreled upper receiver is a great place to start. This receiver is manufactured with strict quality control, plus features an ejection port cover, forward assist, and an integral Picatinny rail that extends the length of the handguard. There is a combat-grade barrel at the heart of the M4-89, which is magnetic particle inspected and high-pressure tested.
- 5.56 NATO
- 16” HPT/MPI 4150 CMV V1 Barrel
- Mid-Length Gas System
- 15″ M89 Free Float M-LOK Drive Lock Handguard
- A2 Muzzle Device
Sons of Liberty Gun Works is committed to making high-quality parts and firearms, and they stand by their products for a lifetime, which is why each of them comes with a lifetime warranty from manufacturing defects. This upper receiver is an excellent foundation for an AR build, and it comes full of some of the best parts available. Choosing this will get you along the way to making a rugged AR build that will last you years of hard use.