Geissele Automatics 5.56 Super Duty AR-15 Rifle - 40mm Green - 14.5"

Manufactured by Geissele Automatics
SKU: 08-187-40G
MPN: 08-187-40G
Manufactured by Geissele Automatics
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Items that are regulated by the ATF have restrictions and requirements: 
•Your entire order will ship only to a Federal-Firearm License holder.
•Please contact your local FFL prior to placing your order to ensure they are still accepting transfers.
•A copy of your order/invoice as well as the current FFL license for your local dealer must be emailed to



The Geissele Automatics Super Duty Rifle is a high-performance AR with so many great features it rivals many custom builds. This rifle represents the perfect marriage between Geissele’s notable Super Duty upper and lower. The upper boasts a 14.5-inch magnesium phosphate, cold hammer forged, chrome lined barrel with a 1:7 twist for optimal accuracy and unrivaled performance. The Super Duty lower is precision machined from 7075-T6 aluminum and features a SSA-E X with Lightning Bow trigger. 

This nanocoated, two-stage trigger features a wide body and bow shape that finds the perfect balance between a classic M4 trigger and a flat body trigger. Additionally, the lower provides a Mil-Spec Geissele buffer tube with a Super-42 in H2 buffer ensuring this rifle is properly tuned out of the box. The Geissele Automatics Super Duty Rifle boasts a nanocoated BCG machined from Mil-Spec 8620 steel with a chrome lined gas key and is properly torqued and staked. It features a 13.5-inch MK16 Super Modular Rail that seamlessly integrates with upper receiver via an aligning tab, removing any chance of rail rotation. This Geissele Automatics Super Duty Rifle come with a unique green finish, called 40mm Green, because the parts in this rifle are anodized in the same dye tanks as military 40mm grenade cases.

  • 14.5" barrel
  • Chambered in 5.56mm
  • 40mm Green
  • Super Duty Lower Mil-Spec
  • Super Duty M4 Upper
  • REBCG (Reliability Enhanced Bolt Carrier Group)
  • Geissele stressproof bolt
  • 13.5" SMR MK16 w/ Geissele center tab
  • SSA-E X w/ Lightning Bow Trigger
  • Chrome Lined Barrel, 1:7 Twist - Geissele Profile
  • Super mid-length gas system
  • Super compact gas block

Geissele Automatics manufactures confidence, offering quality triggers and components for the warfighter and competitor. They were established in 2004 with the mission to build the highest quality, reliable triggers for competition and their first trigger, the Hi-Speed National Match trigger, was so popular that they were asked by the Department of Defense to produce a select-fire trigger for the United States Special Operations. Again, it was a success and Geissele decided to bring a semi-automatic version to the civilian market for law enforcement and personal protection.
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Barrel Coating
Barrel ContourGeissele
Barrel Length14.5
Barrel LiningChrome
BrandGeissele Automatics
Caliber Gauge5.56 NATO
Muzzle DeviceSurefire Closed-Tine Flash Hider Pinned and Welded
Twist Rate1:7

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