Geissele Automatics Super 3 Gun S3G Hybrid AR-15 Trigger .154"

Manufactured by Geissele Automatics
MPN: 05-152
Manufactured by Geissele Automatics
28 Reviews

In Stock

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The Geissele S3G trigger installs in your lower receiver in the same way that a Mil-Spec trigger is installed. It uses a standard .154” trigger and hammer pin so it will fit in any Mil-Spec stripped lower receiver. It features a curved trigger bow that gives you optimum trigger control and ergonomics. Not only does it work in 5.56 or .223 AR-15 rifles, but it works in .308 AR-10 pattern rifles. Each trigger is precision EDM wire cut from heavy duty tool steel with a durable black finish giving you the reliability and durability you can depend on.

  • Uses Mil-Spec .154” trigger pins for maximum compatibility with lower receivers
  • Works with 5.56/.223 and .308 AR pattern rifles
  • Designed as a 3 gun competition trigger
  • Smooth, consistent hybrid trigger pull
  • Includes one 3.25lb spring and one 4lb spring
  • EDM wire cut from heavy duty tool steel
  • Features a curved trigger bow for increased ergonomics
Note: Trigger pull weights are approximate and may vary slightly between rifles.

When building or upgrading your AR-15 rifle, one of the most important components is the trigger. There are many triggers out there so you must ask yourself what are you are going to do with the rifle. Are you going to use it for plinking at the range, home defense, competition, or long-range precision shooting? The answer of this question will help you to understand what trigger you will need. The Geissele Super 3 Gun (S3G) Trigger is designed specifically for competition use where fast follow-up shot and quick target acquisition are required. It features a hybrid single stage trigger that maintains the safety and reliability of a two-stage trigger while still being extremely light and smooth. It has a short pull and quick reset making it easy to shoot your semi-automatic rifle fast. This model comes with one 3.25lb trigger spring and one 4lb trigger spring so you can customize it to your preference. Drop this trigger in your 3 gun competition rifle and you will immediately see a drop in your time during a stage.

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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BrandGeissele Automatics
Drop InStandard Assembly
ManufacturerGeissele Automatics
Total Pull Weight3.25lbs. or 4lbs.
Trigger BowCurved
Trigger Pin DiameterMIL-SPEC .154
Trigger StyleTwo Stage

WARNING: This Product can expose you to chemicals which is known to state of California to cause Cancer and Reproductive Harm. For more information, see

Ratings & Reviews

28 reviews

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Super fast!


After trying and considering several other aftermarket triggers, I found this trigger installed in a Colt custom shop AR-15 rifle. One squeeze of the trigger and that was it! I purchased 3, one for my son's Colt LE6940, one for my LE6920 and one for my Ruger SR556. Unless you have a need to feel, or are required to have that second stage, this is by far the smoothest and fastest trigger you could ever hope to own. I tested both the 3 and 4 lb pull spring on the trigger set and chose the lighter and faster spring for both of my guns and my son did the same. If you like smooth and fast triggers, this one's for you!

Geissele S3G trigger


Bought this trigger on sale here. Installed it in my SBR with the light spring, and it seems more then one pound lighter then the 4 1/2# spring.Finally made it to the range this AM. The reset is supper short and the pull is almost as good as my bolt guns.All in all I am completely satisfied with it.

triggers/s3g trigger


Do not buy this trigger!!!! Do not try a friends rifle with this or any other geissele trigger!!!!!!! I warn you, if you do you will be stuck buying $200+ dollar triggers for life. Nothing even comes close to the feel! This is in my opinion the best trigger out there. Smooth as silk!

Great transaction


Fast shipping, good price. Will purchase from again.

Geissele super 3 trigger


great for bump fire

Slowest 2 Day shipping


I ordered and paid for 2 day shipping. After 10 days, the tracking number still reported the item was not received and was still with Primary Arms. The customer service rep. told me it was not scanned by USPS because of the holiday season when in fact it wasn't even given to USPS in the first place-after 10 DAYS! I am in customer service as well and have learned a long time ago to avoid giving the "I don't known so I'm going to put you off and assume this is the answer" response because it's just bad policy and makes the customer believe you feel I am stupid. It's transparent anyway. Magically, USPS received the shipment the day I sent in the request. Magic! I know that there are issues that happen but be straight with the customer. We aren't stupid people - we are your business - and in a business like this where people shoot and compete together, customer service is everything. We have ordered from you in the past but will think twice before ordering from you again.

Good stuff


Install was easy enough. Love the shorter pull and reset. Don't know why I waited so long to put this on my 3 gun rifle.Primary Arms customer service as promised.

Simply Excellent


Just like all of Geissele's other products this trigger is excellent. Super smooth, no grit, and a very clean break. Combine this with a very short reset and a relatively light pull and you'll be able to send rounds down range faster than before.

Excellent price on an excellent trigger


Primary Arms has probably the best price on this trigger and it performs exactly as described on the Geissele website in the Ruger SR-556 that it was installed in.\

Best addition you can buy


Primary Arms hits a home run as usual. Bought it Friday and it arrived the very next Monday, and that was the free shipping! Now for the trigger...forget flashlights, optics, lasers, grips, and all the other crap you can add to an AR, this thing is all you need! All I can say is its amazing! mine shipped with an optional 4.5lbs spring but the 3.5 just feels so good. Reset is everything I hoped for and more. Note: I installed the strigger with a set off KNS pins at first and picked up grit in the hammer stroke, stick with the pins it comes with like Gissele recomends.