If you're looking for an off-the-shelf Glock G44 15+round magazine, you may want to consider the
ProMag Industries G44 18-round magazine. ProMag Industries has a horrendous reputation when it comes to magazines, however, the ProMag magazine has the potential to perform surprisingly well. And they only cost $12.
Recommendations for Use
Unlike the OEM Glock G44 magazine, you can't simply take a ProMag magazine out of the "box" and use it. The ProMag magazine spring is extremely stout. You'll find the magazine, with its small load-assist tabs, difficult to load and likely unreliable. You must break-in the ProMag magazine spring before using it.
There are two basic approaches to breaking in the spring,
- You can insert a small screwdriver above the follower and exercise the spring through its full range of travel hundreds of times.
- You can (repeatedly) load the magazine to its full 18-round capacity and allow it to sit for a day or two. [Courtesy of @CBTENGR]
You may want to combine these two techniques.
Make sure you're using the load-assist tabs to assist in loading, rather than depressing the follower too far and allowing rounds to "drop in". There should always be tension on the round being loaded.
Pay careful attention to the orientation of each round. The topmost rounds cant up. The middlemost rounds cant down. And the bottommost rounds again cant up. In the picture below, the ProMag magazines (with 15 rounds) are on the right. Note that one of the topmost rounds in the fourth magazine from the right isn't oriented properly. The rounds should alternate left and right.
Once loaded, some shooters turn the ProMag magazine over and give it a firm "tap" to ensure the rounds are seated properly. As with the OEM Glock G44 magazine, it's a good idea to ensure the topmost round is canted up.
You may want to start out shooting the ProMag magazine loaded with 15 rounds. Some shooters never load more than 15 rounds. Some shooters find the ProMag magazine to be more reliable with 15 rounds as compared to 18 rounds. And other shooters have tremendous success with 18 rounds.
You can experiment with a magazine loader to aid in loading the ProMag magazine. Wrap-around magazine loaders specifically designed for the ProMag magazine work best. The magazine loader rests on the ProMag magazine load-assist tabs. Make sure the magazine loader slides freely up and down the magazine. If the magazine loader binds, you won't maintain tension on the round being loaded.
You must take the time to properly break-in your ProMag magazine. If done properly, a ProMag G44 magazine should be as reliable as an OEM Glock G44 magazine.
Experimentation
Warning: Don't attempt to pry apart the ProMag Industries G44 18-round magazine load assist tabs!
Unlike the OEM Glock 44 magazine load assist tabs (which can easily be pried apart with a standard screwdriver), the ProMag magazine follower and load assist tabs are a single, integrated part. And it's a B|TCH to get out! In a nutshell, you need to pinch both load assists at the same time in order to get the integrated follower / load assist tabs past the slots and out of the magazine. It's much easier to reinsert the integrated follower / load assist tabs into the magazine.
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