Description
The Flatback/Invincible Glock Switch is a conversion device that modifies a standard Glock pistol to fire in semi-automatic and full-auto modes. This is for experienced shooters and collectors who understand the legal paperwork and want the unique functionality of a machine pistol. The key differentiator is its robust, one-piece machined construction designed for sustained fire.
Key Features
- Dual-Mode Operation: A simple selector switch lets you go from semi to full-auto. I’ve run thousands of rounds through similar systems, and that instant change is what this is all about.
- Machined Steel Housing: It’s not a stamped part. This one-piece unit is built to handle the stress and heat of automatic fire, which cheaper components simply can’t.
- Drop-In Compatibility: Designed for Gen 3 Glock 17, 19, and 34 models. Installation requires removing the rear slide plate and sliding this unit in, but a proper function check is non-negotiable.
- Extended Selector Lever: Provides positive, gloved-hand operation. After decades of testing, I know that small controls get hard to manipulate under recoil; this one won’t.
| Specification | Detail |
|---|---|
| Compatibility | Glock Gen 3 (Models 17, 19, 34) |
| Material | Machined Steel |
| Operation Modes | Semi-Automatic, Full-Automatic |
| Finish | Black Oxide |
| Installation | Drop-In (Requires Slide Disassembly) |
Honest Assessment
Pros: The build quality is immediately apparent. It has a solid, precise feel that inspires confidence for its intended use. The function is straightforward and reliable when installed correctly on a compatible, in-spec pistol.
Cons: The legal hurdle is the biggest one. This is a National Firearms Act (NFA) item requiring a tax stamp and extensive federal registration before you can take possession—it’s not a simple mail-order part. Secondly, full-auto fire will drastically increase wear on your Glock’s components and burn through ammo at an alarming rate; this isn’t a range toy for casual plinking.
Who Should Buy This
This is exclusively for two types of people: licensed Class 3 SOT dealers/manufacturers, or private individuals who have already secured the proper ATF Form 4 approval for a registered conversion device. It’s for those building a legally registered machine pistol for professional demonstration, collection, or specific training purposes where select-fire capability is required.
FAQ
Is this legal to buy?
Only if you are a licensed dealer (SOT) or have an approved ATF Form 4 transferring a registered machine gun or conversion device to you. For private citizens, you must have the tax stamp in hand before the seller can transfer this item. It is not legal to install on a standard pistol without that registration.
Will this work on my Gen 5 Glock 19?
No. This switch is specifically designed for the Gen 3 fire control system. The internal geometry changed in later generations. Trying to fit it to an incompatible model will not work and could damage your firearm.
How does it affect reliability?
On a well-maintained Glock, reliability in semi-auto mode should be unchanged. In full-auto, the increased cycling rate and heat can lead to accelerated parts wear, especially on the slide, recoil spring assembly, and connector. I’ve seen firsthand how sustained fire demands more frequent maintenance and inspection.
Reviews
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