This upper receiver is side-folding compatible and features Matador Arms® patent-pending EZTS™ “Easy Take-down System” with no tools required to break down the upper for maintenance and cleaning.  The 9mm upper is machined for maximum weight reduction, slim profile, and compatibility with bolt catches and lower receivers. The upper is also built with a tapered multi-material 4-piece trunnion system to maintain mechanical accuracy and durability.

The MAT-9™  9mm AR upper can be configured in two distinct ways:

Native Mode:  Adaptable to the AR-9 Lower Receivers that are compatible with the following double-stack 9mm magazines:

• Glock ®
• Sig Sauer ®
• Colt® Stick Magazines
• HK® MP5™
• CZ ® Evo Scorpion™

Conversion Mode: AR-15 Lower Receiver: Requires the Matador Arms® Mag-X™ magazine conversion kit that is compatible with the following double-stack 9mm magazines:

• Glock ®
• Sig Sauer ®

Some Additional Key Features:

• Non-reciprocating steel charging handle (ambidextrous)
• 4140 Nitrided steel bolt and action parts
• 6061-T6 anodized upper receiver
• 4150 Lightweight Nitrided Barrel, 7.825” long, 1:10 twist, 1/2×28 threads
• NATO 1913 Spec top rail
• 3 MLOK slots (both sides, bottom)
• Compatible with LRBHO (Last Round Bolt Hold Open) lower receiver
• Ready to run with a Suppressor right out of the box!