Geissele Automatics 5.56 Super Duty AR-15 Rifle - DDC - 16"

Manufactured by Geissele Automatics
SKU: 08-188S
MPN: 08-188S
Manufactured by Geissele Automatics
4 Reviews

Out of Stock

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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 is a 5.56 AR-15 rifle that features a Mil-Spec AR-15 lower receiver built out with the Geissele Ultra Duty lower parts kit which includes an ambidextrous safety selector, Super Duty trigger guard, Geissele SSA-E X Super Semi-Automatic Enhanced trigger, and more. The Super Duty AR-15 features a 16-inch Geissele profile barrel with a Surefire Closed Tine War Comp. Includes Geissele M-LOK handguard, Super 42 buffer spring, and H2 buffer.

  • Geissele Ultra Duty lower parts kit
  • Geissele SSA-E X trigger
  • 16" Geissele profile barrel with Chrome Lined bore
  • 15" Geissele SMR MK16 M-LOK Handguard
  • DDC finish
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Barrel CoatingManganese Phosphate
Barrel ContourHeavy
Barrel Length16.25
Barrel LiningChrome
BrandGeissele Automatics
Caliber Gauge5.56 NATO
Gas System LengthMid-Length
Gas System TypeDirect Impingement
Handguard15 in Geissele SMR MK16
Magazine Capacity30
Muzzle DeviceSureFire Closed Tine Warcomp
Thread Pattern1/2 X 28
Twist Rate1:7
California Prop 65 warning

 WARNING: This product can expose you to chemicals, which are known to the State of California to cause Cancer and Reproductive Harm. For more information go to

Ratings & Reviews

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Best first AR15 and online firearm purchase experience ever

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I've been a long time gun owner, but never got around to an AR15 until now. I'd read the guides and listened to the experts who talk about piecing together your own firearm. Alas, these days, I don't have that time, and was willing to spend a little more to get something I knew would be right out of the box.
<br>And I got what I paid for. The Geissele trigger is as good as advertised, and the paint job is superb (actually an anodized coating from what I understand). It's not really FDE, and is instead more of a bronze. Everything was correct as received. For the price paid, I kind of wish the handguard had come with iron sights and a lower rail, but this is minor.
<br>Primary Arms was fantastic during the purchase process, was quicker than they warned (given the virus and slowing due to shipping)&gt; They had my local FFL dealer on file, and the process was painless to say the least. Now I have a new expensive hobby, and two reputable partners (Geissele and PA).

Great firearm and AMAZING customer service from Primary Arms


This rifle more than lives up to the great reviews elsewhere. I wish I'd been carrying this instead of my issue rifle in several hot and sandy places that were far, far from home. The trigger is amazing, and the slim line rail feels perfect. Once I took it to the indoor range, I was shooting 1 MOA groups at 25 yards with Winchester white box ammo. <br><br>Now on to Primary Arms... When everyone else in the country was taking 3 and 4 weeks to ship FFL items, PA shipped my rifle out in less than a week. Unfortunately, the post office took my package across Houston and left it in a distribution center for 3 weeks. They post office was completely unresponsive until PA's customer service department got involved.<br><br> A HUGE shout out to Gabby Strambler at PA for all of her help, and for her personalized follow up with me afterwards. It's that kind of amazing service that makes PA such a great company.

Reliable and High Quality Carbine

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I wanted a 16" carbine for the increased accuracy at longer distance. When I saw this Geissele Super Duty for sale on Primary Arms, I knew this was the one for me. I've read a lot of positive things about Geissele and their superb quality.
<br>Shooting this carbine is a joy. It runs smooth and reliable. I know I can count on it 100% if I ever have to use it for defensive purposes.
<br>I use the Primary Arms 3x32 CQB ACSS scope and it nails 1 MOA groups at 100 yards with M193 55gr. ammo, which is not the most accurate rounds out there, but will get the job done.
<br>If you're wanting an AR-15, I highly recommend this. It is well worth the money spent!

Great upgrade for my AR-15


I owned my first AR-15 for a while and it did it's job, but when I upgraded to the Geissele Super Duty I saw what I was missing. Much tougher, more accurate and just feels better. Love it!