Geissele Automatics Super Duty MOD1 5.56 NATO Complete AR-15 Upper Receiver - 13.9" Pinned - Black

The Geissele Super Duty MOD1 5.56 NATO Complete Upper Receiver is a high-performance upper receiver for the AR-15 platform. It features a 13.9-inch chrome-lined barrel with a 1-7 twist rate, a 15-inch Super Modular MK16 Rail, and a Geissele Reliability Enhanced Bolt Carrier Group with a Stressproof bolt.

The 5.56 NATO barrel is made from high-quality steel and is cold hammer forged for superior accuracy and durability. The chrome lining makes it corrosion-resistant and easy to clean. The 12.9-inch Super Modular MK16 Rail provides a lightweight and versatile rail system that offers plenty of space for mounting sights, lasers, and other accessories. The handguard is designed with a center aligning tab that prevents the rail from rotating.

Features:

• Chambered in 5.56 NATO
• 13.9” CHF barrel with Geissele Profile, 1:7 twist
• Chrome lined
• Mid-length gas system
• Super compact gas block
• HUXWRX Flash Hider-QD 556 Pinned and welded
• 12.9” SMR MK16 handguard
• Super Duty upper receiver with cam pin cutout
• Airborne charging handle
• Nanoweapon Reliability Enhanced BCG
• Geissele Stressproof Bolt with Asymmetric Cam Pin
• Overall length: 23 1/4”
• Weight: 4 lbs. 3 oz.
• Color: Black
  

The Geissele Reliability Enhanced Bolt Carrier Group is designed for maximum reliability and performance. It features a properly torqued and staked gas key, a cam pin made from advanced steel, and extended upper rails for improved feeding reliability. The Stressproof bolt is forged and made from Carpenter 158+ for strength and fatigue resistance. It also comes high pressure tested, magnetic particle inspected, and Nanoweapon coated.