Rock River Arms .450 Bushmaster Mid-Length A4 Upper Half – Stainless (RRA 450 BM MID A4 UPR HALF SS UPPER)

Model/SKU: 450B0461 • UPC: 842834124138
Caliber: .450 Bushmaster • Gas System: Mid-length • Receiver: A4 flat-top (Picatinny) • Barrel: Stainless steel • Platform: AR-15 (mates to most mil-spec lowers)

Unlock big-bore authority on your AR-15 with the Rock River Arms .450 Bushmaster Mid-Length A4 Upper Half (Stainless). Purpose-built around the hard-hitting .450 BM cartridge, this premium A4 flat-top upper gives hunters and property managers the stopping power they want—paired with the familiarity and ergonomics of the AR platform. A stainless steel barrel provides corrosion resistance and long-term accuracy, while the mid-length gas system helps smooth out impulse for faster follow-up shots and reliable cycling with common hunting loads.

Whether you’re chasing whitetails in thick timber, managing hogs after dark, or building a do-it-all big-bore utility rifle, the RRA 450B0461 upper delivers dependable performance in a drop-on package. Pin it to a quality AR-15 lower, add a rugged optic, and you’re ready for the field.

Why Choose This Rock River Arms .450 Bushmaster Upper

• Serious stopping power: The .450 Bushmaster cartridge offers large frontal area and deep penetration for ethical harvests and confident terminal performance.

• Stainless accuracy: A stainless steel barrel resists fouling and the elements, supporting consistent groups through seasonal temperature swings.

• Mid-length gas advantage: Tuned for big-bore pressure curves to help reduce felt recoil and maintain reliability across a range of hunting loads.

• Optics-ready A4: The flat-top Picatinny receiver makes it simple to mount LPVOs, red dots, or traditional hunting scopes at the correct height.

• Rock River Arms quality: Known for tight fit, clean machining, and dependable function that holds up to hard field use.

Key Features at a Glance

• Caliber: .450 Bushmaster (straight-wall, state-compliant in many regions—verify local regs)

• Gas System: Mid-length for smoother impulse and reliable operation

• Barrel: Stainless steel (durable, corrosion-resistant; hunter-ready finish)

• Receiver: A4 flat-top with Picatinny rail for optics/BUIS

• Compatibility: Pins to most mil-spec AR-15 lowers (use properly tuned .450 BM mags)

• Model / UPC: 450B0461 / 842834124138

Field-Ready Performance

• Short- to mid-range dominance: Pair with a tough 1–6x/1–8x LPVO or lightweight 2–7x for fast acquisition in brush and shadows.

• Straight-wall opportunity: In many jurisdictions, .450 BM qualifies for straight-wall hunting seasons—always confirm local rules.

• Confidence in the weather: Stainless construction and quality coatings help shrug off rain, mud, and post-hunt cleanups.

Setup Tips

• Magazines: Use magazines designed or tuned for .450 Bushmaster to ensure reliable feeding.

• Muzzle device: Choose a brake, comp, or suppressor-capable mount matched to the barrel thread spec (verify before purchasing devices).

• Buffering: If needed, optimize buffer and spring weight in your lower to fine-tune recoil and ejection with your chosen loads.

• Zeroing: Confirm POI with your hunting ammo; big-bore trajectories vary significantly by bullet weight and velocity.

Ideal Uses

• Whitetail & hog hunting: Powerful, brush-busting performance with quick follow-ups.

• Ranch & property management: Hard-hitting control in a maneuverable AR format.

• Truck & camp rifle builds: Reliable, low-maintenance stainless barrel for year-round readiness.

Component note: RRA “Upper Half” assemblies are typically delivered as complete uppers, but included parts (e.g., handguard style, BCG/charging handle, muzzle device) can vary by run or distributor. Verify package contents with the retailer before purchase.

Specifications (Summary)

• Product: Rock River Arms .450 BM Mid-Length A4 Upper Half – Stainless

• Model/SKU: 450B0461

• UPC: 842834124138

• Caliber: .450 Bushmaster

• Gas System: Mid-length

• Receiver: A4 flat-top Picatinny

• Barrel: Stainless steel

• Platform: AR-15 (mates to most mil-spec lowers)

SEO Highlights (What Shoppers Search)

• Rock River Arms .450 Bushmaster upper stainless

• RRA 450 BM Mid-Length A4 upper half

• 450B0461 UPC 842834124138

• .450 Bushmaster AR-15 upper stainless barrel

• Big-bore hunting upper optics-ready

Meta Title (SEO)

Rock River Arms .450 Bushmaster Mid-Length A4 Upper Half – Stainless Barrel, Optics-Ready | 450B0461 | UPC 842834124138

Meta Description (SEO)

Add big-bore power to your AR-15 with the Rock River Arms .450 Bushmaster Mid-Length A4 Upper Half. Stainless steel barrel, optics-ready flat-top, and mid-length gas for reliable hunting performance. Model 450B0461, UPC 842834124138.

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**Hard-hitting, optics-ready, and built for the field—**the Rock River Arms .450 Bushmaster Mid-Length A4 Stainless Upper turns your AR-15 into a confident big-bore hunting and ranch tool with drop-on simplicity. The End