Upgrade your AR with the .300 HAM’R 18" Upper—built for serious energy, flatter trajectories, and dependable accuracy. Featuring an 18" 416R stainless Shaw barrel with a 1:15 twist, this setup is optimized to deliver hard-hitting performance while maintaining smooth, controllable recoil.
The adjustable intermediate gas system ensures reliable cycling and tunable performance, while the 15" M-LOK free-float handguard gives you a lightweight, rigid platform for accuracy and accessories. Complete with a nitride BCG, Patriot Arms muzzle brake, and ambi charging handle, this upper is ready to drop on your lower and run.
Performance Highlights:
.300 HAM’R Chambering – increased power & flatter shooting
18" 416R Stainless Shaw Barrel – precision and velocity
1:15 Twist (Button Rifled) – optimized for .300 HAM’R
Blackout Feed Ramps – reliable feeding
Adjustable Intermediate Gas System – smooth recoil & consistent cycling
15" M-LOK Handguard – free-float accuracy & modularity
Nitride BCG Included – durable, ready-to-run performance
Patriot Arms Tactical Brake – reduced recoil, faster follow-ups
Ambidextrous Charging Handle – quick, versatile operation
2 Reviews Hide Reviews Show Reviews
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300 HAM'R upper
Everything with the order and working with Patriot arms and Supply went without a hitch. The upper itself is fantastic. It looks great and is very accurate. Not a single problem with functioning. If you wish your 300 B.O. had that extra velocity, this is your answer. SAAMI approved cartridge and brass is available. Nickel cases are even available from Wilson Combat. Perfect East coast Whitetail set up. From my experience, you won't regret the money spent in the slightest. Very satisfied.
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.300 Ham’r Upper
Bore scoped it when I took it out of the box and it exceeded my expectations. Did the barrel break-in yesterday and was pleased with the ease of cleaning due to only slight tooling marks and smooth rifling. Shot MOA afterwards at 100 yards with 26.5 gr of CFEBLK behind 135gr FTXs and Speer Bonded. If you don’t want to break the bank, you can’t go wrong with this upper.
