DPMS Panther Arms® "Kitty Kat" Premium Complete Upper Receiver Assembly – .300 AAC Blackout – 7.5" Heavy Nitride Barrel – 6.5" Free-Float Aluminum Quad Rail Handguard – Includes Full-Auto BCG & CH – DP51655170308
Product Description
The DPMS Panther Arms® "Kitty Kat" 7.5" .300 AAC Blackout Complete Upper Receiver Assembly (DP51655170308) represents a legendary, ultra-compact short-barrel benchmark in the AR-15 tactical landscape, masterfully reimagined to unleash the full close-quarters potential of the hard-hitting .300 Blackout cartridge. Originally made famous as a pioneering sub-compact platform in legacy 5.56 NATO configurations, the iconic "Kitty Kat" framework receives a massive performance multiplier within the .300 BLK platform. While a short 7.5-inch barrel causes massive velocity drops, deafening muzzle blasts, and unburnt powder plumes when running standard 5.56 ammunition, the .300 Blackout cartridge is structurally optimized for complete propellant combustion inside sub-10-inch barrels. This complete, drop-in upper system (810141221055) strips away excess front-end weight, serving as an indispensable primary asset for tactical home defense configurations, specialized vehicular survival builds, and ultra-maneuverable close-quarters pistol or short-barreled rifle (SBR) deployment setups.
The foundational core of this high-efficiency weapon deck is built around a match-grade 7.5-inch heavy profile Chrome Moly Vanadium (CMV) steel barrel treated with a deep-penetrating **Black Nitride anti-friction armor coating**. This advanced liquid-nitriding process hardens the outer molecular structure of the steel bore, delivering exceptional corrosion resistance and throat life that easily outperforms traditional heavy industrial finishes under rapid-fire thermal cycles. Featuring a fast-stabilizing **1:7" right-hand rifling twist rate**, the bore cleanly spins a wide spectrum of ammunition velocities—from lightweight supersonic defensive rounds up to heavy, bone-crushing 220-grain subsonic configurations. The barrel is equipped with a fixed, .750" low-profile gas block feeding an optimized **pistol-length direct impingement gas loop**, ensuring a smooth, fluid cycling impulse and rock-solid mechanical reliability with or without an auxiliary sound suppressor pinned to the standard **5/8"-24 TPI muzzle threads**.
The true operational triumph of this American-manufactured masterpiece lies in its classic quad-rail architecture and complete, out-of-the-box system fulfillment. Shielding the gas block is a rugged DPMS 6.5" Free-Float Aluminum Quad Rail Handguard, providing four continuous faces of standard MIL-STD 1913 Picatinny slots for the solid, shift-free installation of tactical weapon lights, aiming lasers, and backup iron sights. The receiver shell is precision-forged from 7075-T6 aerospace-grade aluminum alloy, complete with laser-etched T-marks, an integrated forward assist, a spring-loaded dust cover, and an M4-profile feed-ramp extension. To provide total immediate staging authority, DPMS packages this upper complete with a **mil-spec full-auto profile 8620 steel bolt carrier group** featuring a shot-peened Carpenter 158 steel bolt, an internally chrome-lined carrier track, and a properly staked grade 8 gas key. Weighing an incredibly agile **3.60 pounds**, this drop-in modular upper locks instantly onto your favorite lower receiver to establish absolute tactical dominance downrange.
Includes: (1) DPMS Panther Arms "Kitty Kat" 7.5" .300 Blackout Complete Upper Receiver Assembly (Mil-Spec 7075-T6 Forged Receiver, Black Nitride Heavy Barrel, 6.5" Free-Float Aluminum Quad Rail, A2 Flash Hider), (1) Pre-Installed Full-Auto Profile Carpenter 158 Steel Bolt Carrier Group (BCG), (1) Standard Mil-Spec AR-15 Charging Handle, and Protective Distribution Box Packaging.
*Safety/Installation & Regulatory NFA Guidance: The DPMS DP51655170308 complete upper receiver assembly is designed to drop natively onto any standard, mil-spec AR-15 pattern lower receiver unit. Because this component incorporates an ultra-short 7.5-inch barrel footprint, mating it to an AR-15 lower receiver that is natively configured with a traditional rifle buttstock legally classifies the resulting complete weapon as a Short Barreled Rifle (SBR) under federal laws. This configuration requires active National Firearms Act (NFA) registration and an approved ATF Form 1 prior to assembly. To maintain immediate civilian regulatory compliance without NFA documentation, this upper receiver must be hosted exclusively on a lower receiver legally documented and maintained as a handgun/pistol platform (utilizing an approved pistol stabilizing brace or bare buffer tube). Always visually and physically verify that your host receiver is clear of live ammunition prior to pin alignment drills.
Key Features
- Iconic "Kitty Kat" Legacy Geometry: Delivers an ultra-short, ultra-maneuverable front-end layout that effortlessly maneuvers through tight home-defense corridors and vehicular cabins.
- Optimized .300 Blackout Chambering: Exploits the low-pressure efficiency of the 7.62x35mm cartridge, ensuring complete powder burn and massive terminal downrange impact out of a short barrel.
- Heavy-Contour Black Nitride Barrel: Premium Chrome Moly Vanadium steel barrel features a liquid-nitride armor coating to conquer intensive friction and environmental corrosion loops.
- 6.5" Free-Float Picatinny Quad Rail: High-strength structural aluminum quad-rail handguard offers 4-sided accessory real estate for rock-solid laser and weapon light placement with zero zero-shift tracking flex.
- Carpenter 158 Full-Auto Profile BCG: Ships fully equipped with an M16-profile shot-peened steel bolt carrier group, featuring a properly staked gas key and a chrome-lined interior track.
- Forged 7075-T6 Aluminum Upper: Mil-Spec forged receiver shell includes laser-etched alignment T-marks, an integrated forward assist, a flip-up dust cover, and smooth M4 feed ramps.
Product Specifications
- Brand: DPMS Panther Arms® (Manufactured natively in the USA)
- Product Line: "Kitty Kat" Specialized Short-Barrel Complete Upper Receiver Group Series
- Model Designation: DPMS "Kitty Kat" 7.5" .300 BLK 6.5" Quad Rail Upper with BCG & CH
- SKU / MPN: DP51655170308 (Alternative Factory Identifiers: DP51655170308-DPMS / DPMS-75-300-QUAD)
- Firearm Lower Compatibility: Fits Standard AR-15 Pattern Lower Receivers (Legally Registered Handgun or NFA SBR Layouts Only)
- Caliber Class Chambering: .300 AAC Blackout (7.62x35mm / 300 BLK)
- Operating System Layout: Direct Impingement (DI) Pistol-Length Low-Profile Gas Block System
- Gas Block Diameter: Standard .750" Micro Low-Profile Fixed Gas Block Core
- Barrel Length Specification: 7.50 Inches (190.50 mm) Sub-Compact Performance Profile
- Barrel Profile / Contour: Heavy Rigid Structural Contour (Non-Chrome Lined)
- Barrel Steel Matrix: 4150V Chrome Moly Vanadium Steel Base Component
- Barrel Surface Treatment: Fully Treated Corrosion-Resistant High-Gloss Black Nitride Armor
- Rifling Twist Rate Parameter: 1:7" Precision Right-Hand Twist (Optimized for Heavy Subsonic & Supersonic Loads)
- Muzzle Thread Pitch: 5/8"-24 TPI (Threads Per Inch) Standard Heavy-Caliber Muzzle Profile
- Pre-Installed Muzzle Device: Standard A2-Style Birdcage Flash Hider (Salt Bath Nitride Treatment)
- Handguard Attachment Class: DPMS 6.5" Aluminum Free-Floating Monolithic Quad-Rail Picatinny Handguard
- Upper Receiver Style: Forged A3 Flattop M4 Pattern with Laser-Etched Picatinny T-Marks
- Receiver Construction Base: Forged 7075-T6 Aerospace Structural Aluminum Billet
- Receiver Finishing Armor: Non-Reflective Abrasion-Resistant Mil-Spec Type III Hardcoat Anodized Black Matte
- Bolt Carrier Group Core: Full-Auto Profile M16 Pattern 8620 Steel Carrier (Chrome-Lined / Phosphate Finished)
- Bolt Hardware Specification: Shot-Peened Mag-Phosphate Carpenter 158 Steel Bolt with Grade 8 Staked Fasteners
- Charging Handle Assembly: Included Standard AR-15 Mil-Spec Aluminum Charging Handle
- Product Net Component Weight: ~3.60 lbs (~57.60 oz) - Ultra-Light Balanced Upper Receiver Suite
- Total Packaging Shipping Mass: ~4.50 lbs (Enclosed Inside Heavy Padded Protective Distribution Staging Box)
- UPC Barcode: 810141221055
