DYTAC SLR Licensed Functional Magazine Extension for Gas Blowback Airsoft Pistol Magazines (Model: Elite Force GLOCK 17)

"If you're looking for an advantage to add to your airsoft Glock this is the product for you. Under ideal temps. you're looking at around 3 and a half mags off of one charge possibly 4 if you're lucky. I personally was able to get 28/29 bbs to fit with this extension. This is a must have if you're wanting to get the most out of your EF Glock 17 & 19x.

"Great little upgrade!! Slapped one of these in my g19x mags and i get 5 additional bbs. Youll need the 17 plate for the 19x mag.

"So I very, very much want to give these 5 starts but can't for a pretty good reason.

I'll get into that in a second, but overall these have been well worth the price. Gives an extra 3-4 rounds per mag which is nice. Increasing the gas capacity is huge. Even in very cold weather you can always get a full mag out of a fill, and here in FL I'm consistently getting 2 full mags per fill.

The cosmetic effect is also very appealing, gives a aggressive look, and I've had several people ask about where they can get the 'extended' mags.

Now for the reason I dropped a star, two of the mounting screws that you use to attach this to your mag are very short. They only stick maybe a 1/4 inch into the mag, and it is VERY easy to strip them getting them tight enough to hold so you don't get gas leaks.

I solved this by getting longer screws. You will need 2 per mag, replacing the two screws on the front of the mag. They are M2.5 35mm or 40mm machine screws. Make sure the screw heads are 4mm, and NOT knurled otherwise they won't fit. I got product 91292A313 on McMaster(hardware website) and they work great.

I would also grab some spare O-rings (Evike sells them ID: 87380), it is very easy to pinch them, and defiantly grab some if your mags have seen some use.

These do work on both the Elite Force mags, and the Spartan ones as well. For those wondering.

Overall I would consider these a fantastic purchase, I wish I could give 5 stars but having to track down screws that will hold better was inconvenient. I hope Dytac will take note of this, because otherwise this is a great product and something I would consider a must buy if you run a pistol primary setup.