KCI USA AR 15 50 Round Drum Mag 5 56mm 223 Rem Black Clear Polymer 50rd KCI MZ036 KCIMZ036 UPC 851586008054
Product Description
The KCI USA® AR-15 50-Round Drum Magazine (SKU: KCI-MZ036 / UPC: 851586008054) provides 50 rounds of uninterrupted firepower in a compact, balanced single-drum footprint engineered for Mil-Spec AR-15, M4, and M16 rifles. Chambered for 5.56x45mm NATO, .223 Remington, and standard-length .300 AAC Blackout cartridges, this drum eliminates frequent reload downtime during high-round-count range training, 3-Gun stages, and defensive staging.
Built in South Korea to rigorous military-contract quality standards, the KCI-MZ036 combines a reinforced matte-black polymer STANAG feed tower with a heavy-walled, translucent clear polycarbonate rear drum shell. This dual-material architecture gives shooters immediate, at-a-glance round-count verification without sacrificing structural impact resistance or feed-tower rigidity. Inside, a tempered steel constant-force spring and low-friction polymer follower assembly ensure smooth, consistent cartridge presentation from round fifty down to bolt lockback on the final shot.
Designed to clear prone shooting positions and standard rifle rests far more easily than bulky dual-drum designs, the KCI 50-round drum includes a snap-on polymer dust cover to protect the feed lips during transport and a dedicated tube of dry graphite lubricant to maintain peak internal drive efficiency in dusty or high-heat environments.
*Armorer Bench Notes & Real-World Staging Guidance:*
Fitment Matrix: Fits Mil-Spec AR-15 / M4 / M16 forged and billet lower receivers chambered in 5.56x45mm NATO, .223 Rem, and .300 BLK (supersonic loads under 2.260" COAL). CRITICAL WARNING: Will NOT seat in HK416/MR556 or proprietary lowers featuring oversized, steeply flared magwell collars due to drum housing clearance. Use ONLY the included dry graphite lubricant internally; NEVER apply liquid gun oil or grease inside the drum, as wet lubricants bind with carbon fouling and degrade polycarbonate clarity.
- Ensure the host firearm is completely clear, existing magazine removed, and chamber visually and physically verified empty before fitting or testing.
- Remove the protective black feed-tower dust cover and inspect the feed lips and follower path for debris; apply a light dusting of the included dry graphite lube to the internal rotor track if required.
- Load cartridges sequentially through the top feed tower by pressing straight down and sliding back beneath the feed lips; stop at the 50-round maximum capacity.
- Seat the loaded drum firmly into the AR-15 magwell until the magazine catch locks positively into the STANAG catch recess, then pull downward to verify retention.
- Chamber a round using the charging handle or bolt catch, confirm full bolt-carrier battery, and verify cycling reliability with your chosen ammunition prior to staging.
Key Features
- Translucent Clear Polycarbonate Drum: Smoke-clear rear housing allows instantaneous visual confirmation of remaining round count.
- 50-Round Compact Single-Drum Profile: Delivers 66% more capacity than a standard 30-round magazine while maintaining a low center of gravity for prone and bench shooting.
- Reinforced Black Polymer Feed Tower: Precision-molded STANAG 4179 tower locks securely into Mil-Spec AR-15 magwells and activates the last-round bolt hold-open.
- Tempered Steel Spring Drive: High-tensile internal spring mechanism engineered for consistent upward feeding and long-term loaded storage durability.
- Complete Field Maintenance Kit Included: Ships with a snap-on protective feed-tower dust cover and a tube of dry graphite lubricant.
Product Specifications
- Brand: KCI USA®
- Model/Series: AR-15 50-Round Drum Magazine
- MPN / SKU: KCI-MZ036 / KCIMZ036
- UPC: 851586008054
- Caliber Compatibility: 5.56x45mm NATO / .223 Remington / .300 AAC Blackout
- Capacity: 50 Rounds
- Body Material: Glass-Filled Polymer Feed Tower / Clear Polycarbonate Drum
- Spring Material: Tempered Steel Constant-Force Spring
- Finish / Color: Matte Black / Translucent Clear
- Dimensions: 9.25" H x 6.40" W x 5.15" D
- Included Accessories: Protective Feed-Tower Dust Cover & Dry Graphite Lubricant
- Platform Compatibility: Mil-Spec AR-15 / M4 / M16 Lower Receivers
- Country of Origin: South Korea
