Description
This is your dedicated magazine for rimfire conversion training with your Glock G20 or G21. Built from durable polymer, the AACLE2021 holds 10 rounds of .22 Long Rifle and is engineered to pair exclusively with an Advantage Arms conversion slide kit. The advantage here is straightforward: tap into the economics of .22 LR ammo without sacrificing the familiar controls and ergonomics of your centerfire Glock.
Last-Round Hold Open for Conversion Training
One feature that sets this magazine apart is the built-in last-round hold open. This means your slide locks back after the final round, just like it would with your factory Glock magazines. That attention to detail matters when you're working on fundamentals and want your conversion kit to feel as much like your duty gun as possible.
What to Expect from the Polymer Construction
The magazine body is impact and corrosion-resistant, paired with a steel spring and polymer follower. This combo delivers smooth feeding and consistent performance through hundreds of rounds. The matte black finish matches the standard Glock aesthetic and blends right in with the rest of your gear. Weight is minimal at just a quarter pound, so carrying multiple mags in your range bag is no burden.
Made in the USA
Advantage Arms builds these stateside with the same durability standards you'd expect from a company that's been in the conversion business for decades. This magazine only works with Advantage Arms .22 conversion kits for the G20 and G21, so make sure you've got the conversion slide kit before ordering this. Think of it as a specialized tool built for one job, and it does that job reliably.
Key Specifications
- Manufacturer: Advantage Arms
- Manufacturer Part Number: AACLE2021
- UPC Code: 094308000725
- Caliber: .22 Long Rifle
- Capacity: 10 Rounds
- Compatible Models: Glock G20, G21 (All Generations)
- Material: Polymer Body with Steel Spring
- Finish: Matte Black
- Last Round Hold Open: Yes
- Weight: 0.25 lbs
- Country of Origin: Made in USA
- Type: Conversion Kit Magazine
What’s Included
- One 10-round .22 LR conversion magazine
Frequently Asked Questions
What conversion kit does this magazine work with?
This magazine is designed exclusively for the Advantage Arms .22 LR conversion kit that fits Glock G20 and G21 frames. It will not function without the matching conversion slide kit, which is sold separately. Make sure you have the full conversion kit before ordering this magazine.
Can I use this magazine in my factory Glock G20 or G21?
No. This magazine only works when your G20 or G21 frame has been fitted with an Advantage Arms .22 LR conversion slide kit. Using it in a factory frame could cause damage or injury. It's a specialty magazine designed for conversion kits only.
What ammunition does this magazine feed?
This magazine is chambered for .22 Long Rifle (.22 LR) rimfire ammunition only. Advantage Arms recommends CCI Mini-Mags and Remington Golden Bullets for reliable performance. Avoid Federal bulk packs and low-velocity rounds, as they may cause feeding issues.
Does this magazine have last-round hold open?
Yes. The magazine features a built-in last-round hold open function that locks your slide back when the final round is fired, giving you a clear indication of an empty magazine just like your factory Glock mags do.






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