King Arms 40 Round Magazine for King Arms Gas Blowback Rifles

"Whoever said they dont work with the S&T Matrix M4 is lying lol. It does, but its a reaaaaally snug fit. You have to break them in your gun. Then the rest of your mags literally slip right in lol.

"The only mags that will work in the Matrix/WA GBBR!
Not the S&T/WA they mistakenly confuse these with!
These will only work in version 2 GBBR! The full metal Matrix rifle with Matrix Engraved on the receiver!

The S&T GBbR that look similar will only use version 1 Gas mags with a rounded off Valve reset(the reset on the top right side of the mag.

These mags here are steel mags with no body pins,upgraded anodized valve that works with the weak hammer springs that come in these.
These work far better than the standard mag all around!

The V2 Gas mags use a sharp pointed reset valve that’s twice as tall as the V1 Gas mags.
Your S&T/Matrix /WA uses v1 not these V2 mags!
I love these mags but wish they were under $60!

The matrix WA V1 mags fir the other rifle are in stock right now aswell, just don’t attempt to ever take them apart! Especially the body mid pin! Only oil them and fill with gas! If you let the gas drain they will leak! Keep them oiled and filled at all times and you’ll not have issues!

To see this mag and the other new Rifle mags fir the other rifles check out “Ultra Collector Custom Airsoft” on YT! It’s the “Amazing New S&T Matrix/WA gas mags EVIKE video!
Hope this helps!

"I am using this mag with the Matrix full metal GBBR. The fit and finish of the mag is solid; I was a bit surprised to see that they were actually more of a silver / light gray color. I purchased a total of 5 mags and all have proven to be leak-free and to feed very well. It took me a few minutes to figure out how to load the mags with the included speed loader but now loading is a breeze. Another surprise came with the capacity of the mags, as these are actually 40+ round mags, not just 30rds.

For use with the Matrix full metal GBBR, the fitment is very tight. After a few mag changes it becomes easier. Be sure to practice before playing as the mags became stuck in the magwell a couple times. This happened only once with 2 of the mags.

Overall I am very impressed with the initial quality and performance of these expensive mags lol. I would recommend them.

"Got mine in the mail today.

Gassed it up and fired a few rounds through it, no issues.

Pros: No leaks,(so far). Great feeding, better than my Pmags. Doesn't have 30 pins to disassemble!

Cons: Weight, a bit on the heavy side. Pmags are lighter.

I haven't had the need to strip it down yet, but it looks really straight forward, and shouldn't pose any issues.

"This mag is ok, I got three of these for my WA matrix Ar 15/M4 and at first these would not go into the mag well. I had to sand it down in order to fit these magazines in. So far only a minor leak that I fixed by injecting some silicon oil inside the mag (one mag out of three has leaked). This mag feels chonky, you can probably kill someone with these things as they weigh around a good pound and a half each. the reason I give these mags a 3.5 to 4 stars is because one of the mags just blew out all the gas as a result of the valve being stuck in the open position for some odd reason. I have not found a way to fix this. I also rate these mags 3.5 because the gas valves on all three mags are horrible! More gas comes out from them than what goes in and its kind of annoying... I remedy this by just taking my time wasting all my gas to make sure I fill these up properly. If you find yourself asking, I've had these mags a little over a year now.

Pros:
Good build quality
Good gas efficiency
Good Weight (not a problem for me)
Reliable

Cons:
Horrible fill valves
Expensive $$$

Don't think for a second that these mags are horrible just based off the rating or the review, these are pretty good mags and have not let me down ( 1 mag has let me down but I still have two more), these have fed all the bb's correctly, has not made my gun jam, and they are pretty efficient.

"Much better than the first version. So far no leaks. It fits really tight in my King Arms M4A1. It will have to be sanded to fit smoothly. Do not get the King Arms fill valve if you need to replace the fill valve KA-GBBP-26. It is too large and would have to be re tapped.

"I hate to leave bad reviews, but King Arms what are you doing? Despite appearing well built and heavy duty; two of four magazines ordered leaked within just a few fills; and all of these magazines are all different dimensions, so serious issues using in my King Arms EMG/Daniel Defense M4; some of the magazine figment was so tight, after a few uses it sheared off the magazine catch retaining screw because of the pressure upon insertion and retention in the lower receiver; the only magazine that fits properly is the one that came with the rifle; so I guess extras or pointless? Can’t use as a training aid because reloading is now a slow careful exercise and the tight fit means extra resistance on the bolt and mandatory use of the forward assist! Oh did I mention I need to order a new magazine release now to fix my rifle?

If not evident enough just wow! Feeling really burned by King Arms, when your own brand name products don’t work you’ve got an issue; I hope this saves someone else some money!