Geissele Automatics Super Duty Mod 1A Ambidextrous SBR 12.5″ 5.56, Desert Dirt Color
The MOD1-A retains the proven performance and features of the Super Duty MOD1 platform, while incorporating fully ambidextrous controls.
The MOD1-A utilizes the same intuitive layout used in Geissele’s GFR and MRGG rifles. A magazine release on the left side of the receiver below the Maritime Bolt Catch makes mag changes swift for left-handed use. The right side of the receiver features bolt catch and release buttons below the ejection port. The shooter uses the dust cover to apply pressure to the bolt catch to lock the bolt open, and a release button just rearward easily sends the bolt forward.
This 12.5” short-barreled rifle chambered in 5.56mm features a nanoweapon-coated HUXWRX Flash Hider-QD installed on our 12.5” Manganese Phosphate coated, Cold Hammer Forged, Chrome Lined, 1-7 twist barrel. Geissele barrels are High-Pressure Tested (HPT) and Magnetic Particle Inspected (MPI). The Geissele length gas system and Geissele Super Compact Gas Block (with bomb-proof installation) ensure reliability and optimal performance in extreme conditions and heavy use.
The Forged Stressproof Bolt is made from Carpenter 158+, directly developed with Carpenter Steel metallurgists to create a material that is cleaner and has less impurities, resulting in up to 5 times the life of a mil-spec bolt.
At your fingertip and purpose-built for precision is the SSA-E X with Lightning Bow trigger. The 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.
Purpose-built and duty-proven, the Super Duty MOD1-A refines an already exceptional rifle system with enhanced controls and greater adaptability—making it a trusted platform for shooters who demand peak performance without compromise.
Specifications
- Length Collapsed: 30″
- Length Extended: 33.25″
- Weight: 6 lbs 8 oz
- Caliber: 5.56mm
- Color: Desert Dirt Color
- Lower Receiver: Super Duty Ambidextrous Billet Lower
- Upper Receiver: Super Duty M4 Upper
- BCG: Reliability Enhanced Bolt Carrier Group
- Bolt: Geissele Stressproof Bolt
- Rail: 11.5″ MK16 Super Modular Rail with Center Tab
- Trigger: SSA-EX with Lightning Bow
- Barrel: 12.5″ Cold Hammer-Forged Barrel, 1:7 Twist, Geissele Profile
- Gas System: Carbine Length
- Gas Block: Super Compact Gas Block
- Gas Port Size: 0.065″
- Charging Handle: Airborne Charging Handle
- Muzzle Device: HUXWRX Flash Hider QD 556
- Lower Parts Kit: Ultra Duty Lower Parts Kit
- Buffer: Milspec 6 Position, 7075-T6
- Buffer Assembly: Super 42 Spring with H3 Buffer
- Stock: B5 Systems Enhanced SOPMOD Stock w/ QD Endplate
- Grip: Geissele A17
Regulations
This is a regulated item and requires shipment to a FFL/SOT holder. After you have placed your order, please have your order number and a copy of your preferred store’s FFL/SOT emailed to info@rooftopdefense.com to avoid delays. After I have received their FFL/SOT, I will file a Form 3. Upon approval, I will ship your order as soon as possible!
Nathaniel V. (verified owner) –
Let’s get the simple part out of the way. This is Geissele, there’s no debate on quality. Here’s the part I was not prepared for. I’ve never fired a suppressed 12.5 and have it be this pleasant of an experience out of the box. The ejection pattern is at that perfect 3 o’clock position. That braided 42 buffer system is seriously some black magic type stuff. The Lightning Bow SSA-E X trigger is phenomenal. It’s the perfect trigger for a rifle like this. I’ve used a normal SSA-E but, the SSA-E X’s trigger profile with the wider face and the semi-flat contour has made this thing one of the easiest rifles to shoot at speed and not outpace the trigger and the rifle settles so well. I’m also not Jerry Miculek so I doubt that would happen anyway but, you get the point. These triggers are just something you have to try for yourself to understand just how great they are. Now, the “A” part of MOD1-A. The ambi controls are outstanding. Simply put, it’s the most intuitive controls for an ambi rifle I’ve ever used. The ejection port cover, when opened, interfaces with the bolt catch, so all you have to do is use your trigger finger to press in the cover, and then pull to lock. The release is right below it, but very quickly I learned it’s nearly impossible to confuse the two once you’ve done it just a couple of times. The fit and finish of everything has surpassed all of my expectations, but at this price point you’d surely hope so. After two range trips and about 500 rounds later, I did a full clean and fresh lubrication, snaked the barrel, and I am happy to report it’s comfortably printing single MOA groups or less with 75gr and 77gr ammo. Best group so far has been .89 which is just ridiculous for a 12.5. If you have the means, no pun intended, send it. You will love this rifle.