My lawyer managed to file the patent application before the USPO close for the year. So it is ready to be shown to the public, and here you go for the video.

Longziz #2

For those who are expecting Longziz #2 as another firearm, sorry if this disappointed you. Longziz #1 took almost three years to be finished manufacturing, while longziz #2 only took 2 days. So it is not hard to accept that #2 is just an accessory.

However, in terms the sequence the concept came into my mind, Longziz #2 is way earlier than Longziz #1. As you may know, the first AR I have ever bought is 7.62X39 caliber, and it was in the year 2006. The reason I didn’t buy the 223 caliber is simple, my first rifle was a SKS and I don’t have any other rifle in 223 caliber. To simplify ammo storage, I choose the 7.62X39 caliber instead. When I bought the rifle, I know the high capacity magazine is hard to find. A friend of mine also has AR in this caliber and he managed to collect almost all possible magazine for this caliber. However, none of them work flawlessly. By then, the Cproduct LLC was claiming developing 30 rounds magazine for this caliber. However, that claim lasted for more than two years. While waiting, I bought two Cproduct magazines, one in 6.5 Grendel caliber and one in 6.8 SPC caliber. One is with a blue follower and the other is with a black follower. They are not made for M43 rounds so I experienced a lot of jam when used on my 7.62X39 AR15. While waiting impatiently for the dedicated M43 magazine to come, my mind started to work in gear of what I can do to ease the frustration.

The idea is very simple. The M43 round will introduce far more tilt inside of the STANAG magazine comparing to other calibers. If a non-tilt follower is used, the rounds can have a nose dive if certain amount (very small) of ammo is inserted, hence more prone to induce jam. If a tilt-able follower is used, the follower tend to tilt too much if a large amount of ammo is inserted, such that the follower would slide into the gap between the round tips and the front magazine wall and cause the ammo tail sink into the cavity the follower left behind, which also introduce jam. So I thought, maybe I can use a two piece follower approach, one that is non tilt, while the other is tilt-able. This way, the follower assembly would be stable inside of the magazine, while the tilt-able piece to accommodate tilt introduced by the ammo.

I can’t remember exactly why I didn’t prototype this idea by then. Maybe it was only in 2006 and I had not felt the pressure of graduation yet. Or perhaps because I thought it was too expensive to make a prototype since all magazine followers are made by injection molding. Or partly because I thought that Cproduct will have the M43 magazine out soon so my design may have no use.

In the end, it took Cproduct more than two years starting from the first time they claimed to have the magazine out in a few weeks. By then, it is already 2008 (if I remember correctly), and I have already known that I was going to move to Germany, so that magazine did not mean much anymore, since I have to get rid of the AR. Besides, I had started the Longziz #1 project, so the follower idea was put into my back shelf, until I came back to the States to finish Longziz #1 for the last time. After all, I found out that after five years since the Cproduct had started to make the magazine for this caliber, we are still in the situation of not having the right magazine for this caliber. And I can’t believe that no one else have come up a similar idea to address this. And for the two years that I was living in Germany, I have time to develop the idea even further. However, longziz #1 was still the priority, until now.

Range Report

Well if you do come out with this and the followers are reasonably priced I would imagine you'd have a pretty big market for these... I know I would pick up a couple dozen

Fred R.

I like it. The only problem I see is that chainsaw is leaking bar oil all over your cement.

Guys, I need you help on testing Longziz #2.

Whoever lives in Chicago area, that either have an 6.8SPC upper and/or 6.5 Grendel upper, and willing to help, please contact me. I will ask a friend of mine to meet with you to use Longziz #2 on your rifle, to see if it can feed those caliber efficiently without any problems. Your help will be highly appreciated, and you are welcome to ask for return. Thanks!

Again, happy new year!

Tagged for interest as a 7.62x39 AR owner who would deperately like a 20-something capacity mag.

Impressive to say the least. Very excited to see what's next.

Longziz,

I have always stayed away from the 7.62x39 uppers because of the magazines. Your take on the situation is as innovative as your other project (#1).

It is great to see such a breath of fresh air in the firearms community - I wish you much success!

It's been a week since I started the post and it seems to me that whoever figured out what the Longziz #2 really is didn't actually speak out. So let's cut the chase and reveal what the Longziz #2 really is.

The 7.62X39 has the most tapering casing among all AR calibers. If Longziz #2 can handle it with ease, theoretically it has the capability to handle any casing that its casing tapering is smaller than the 7.62X39. The #2 in this current configuration should be also feed 6.8SPC and 6.5 Grendel reliably without any changes. However, with my patent pending self adjustable mag shell design, the completed Longziz #2 is a universal magazine that can feed ALL AR15 double stack-able, center firing, rifle cartridges reliably.

I know, I don't have a video to prove that just yet. In last summer, I run out of time and production means so I didn't make the mag shell. However, if you have seen what I have shown, do you have the confidence to believe that what I said may very likely to be true?

Very interesting.

What would the capacity be for a .223/5.56 case? 30?

Very cool. Keep up the good work. I'm in the Chicago area, but unfortunately do not have the 6.8 or 6.5 calibers you need tested

usmc0331tamu00, thank you very much for your offer, you are so kind. However, no offense, but I am not sending out the prototype for test. A face to face range time with my friend is the only way I am looking for. Since the time is really limited, I am not pushing it anymore. As one of the member suggest, I may buy a 6.8 and 6.5 upper myself. It's a good excuse to enter into this caliber now.

Just out of curiosity ...... have you tried this out with rimmed cartridges? If your follower would allow the reliable feeding of rimmed cartridges out of AR (and other) mags, you will have changed the firearms world.