The 300 HAM'R was developed for optimal terminal performance in a standard AR rifle - and offers near .308 Winchester effectiveness while exceeding the ballistics of the famous 30-30 rifle - the most popular hunting cartridge of all time.
The 300 HAM'R cartridge surpasses the 300 BLACKOUT in multiple aspects at a distance of 200 yards, featuring an impressive 18% increase in retained velocity, a substantial 40% boost in energy, and an astonishingly flatter trajectory by 56%. This exceptional performance is complemented by outstanding accuracy and minimal recoil when paired with a lightweight and compact standard AR platform, which seamlessly incorporates a standard 5.56 Bolt. It's worth noting that this Assembled Upper Receiver also includes the Bolt for added convenience.
With a legacy spanning over a century in gun barrel manufacturing, Shaw Custom is a global leader. Trusted by major firearm manufacturers and discerning individuals, Shaw gun barrels set the standard for excellence. Explore a history of quality and precision, recognized worldwide for delivering the best in firearm performance.
We meticulously craft the 300 HAM'R, utilizing reliable, high-quality components. Our assembly process includes precise torquing to Mil-Spec standards, thorough headspace checks, and the inclusion of a supplied bolt. Furthermore, we ensure upper receivers are trued, barrels are bedded to guarantee peak accuracy and performance. Prior to shipment, each firearm undergoes meticulous gas system adjustment and test firing with supplied bolt to ensure optimal functionality and safety.
Features:
Caliber - 300 HAM'R/Shaw
Length - 18" Barrel
Material - 416R Stainless Steel
Finish - Matte, Bead Blasted
Twist - 1-12 Button Rifled
Ramp - Blackout
Gas System - Adjustable, Intermediate
Hand Guard - 15" MLOK
Bolt - Nitrite
Muzzle Brake - MBP
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.
