Just want to add some info to this topic, in case anyone is considering to buy an Adder. Currently have 3 other crossbows (2 Excaliburs and a Scorpyd), but I fell in love Jorg`s invention on YouTube. I`m using it over 1,5 month now and here`s what I think.
The 130 lbs version is too powerful for the cheaply made factory bolts. No detailed info on the shaft, insert etc. I ruined 3 of them in the first 10 minutes of my 1st shooting session. The vanes are too weak, and even a 1/4" penetration into a target can tear them easily. Also got a nock failure caused explosion (the top part of the half moon broke off) in the magazine, which, - beside ruining the bolt and the string - busted a hole in the front end of the magazine ($299 for a new magazine, I`ll detail the overpricing later).
The average bolt weight is 195 grain (factory), which is borderline light for the 130 lbs imo. I think 205-210 should be the minimum. The orange aftermarket (not saying "chinese made" since I believe the factory bolts are Made in China too) versions on Amazon are slightly heavier (210 grains average), but won`t even fit in the magazines. They are too long, and the vanes are about 3/4" from the nock (1/2" on the factory bolts). By cutting them down to the proper size makes them lighter, but still a hair over 200 grain.
In spite of the warranty warnings I started to make my own bolts almost right away. First, just replaced the damaged vanes (2" Boehning Blazers are perfect imo), then bought and modified a dozen orange variants from Amazon. Then I came across 2 extremely useful videos by Mike H on YouTube (Cobra RX Adder arrows are too proprietary, and Cobra RX Adder arrow building). I followed the basic ideas, but also improved some. For example: instead of cheap arrows from Amazon, I used Black Eagle Zombie Slayer shafts (300/.003) which gives a solid weight (over 200 grains) and reliability (I`m using the crossbow versions with my Excaliburs over 6 years without ANY issues). I made a wooden template, so I can copy the shape of the factory vanes almost 100%. Almost, because the Blazers have pointy front, which helps to survive even deeper penetrations. I went through the modification of regular arrow nocks, but it`s very time consuming and the results are not really consistent, so I wouldn`t recommend that path. The nocks from AliExpress (the link is available in the discussion section of the 2nd video) are better made than the factory nocks imo. The base is slightly beefier, the half moon is 1/16th wider. Still, after about 25-30 shots you can see some scratches on them, and since the first nock failure I don`t take any chances: discarded and installed new ones. Still, the nocks are the biggest issue with the 130 limbs. They go fast if you shoot a lot (which I think is the reason to have a repeating crossbow).
Most of the factory accessories are way too overpriced, especially because a lots of those are cheaply made, poor quality. The fore mentioned 7 shot magazine is well made, but HALF of the price of the WHOLE CROSSBOW! 5 nocks for $8.99? I paid $13,68 (with shipping!) for 100 on AliExpress. The $30+ laser that came with the crossbow wasn`t good enough to keep my cat busy with it. The one I got from Amazon for $27 is visible from a 100 yards in a sunny day, has the proper screws for windage/elevation adjustment AND a remote pressure switch. $4,50/factory bolt, as oppose to $2,20/my Zombie Slayer based top quality bolts. I also use 60xString made strings. $15 more than the original, but at least they are Made in USA.
Other minor issues:
The cocking lever has a lot of side-to side movement, which could be fixed with washers at the top joint (front of the crossbow), and at the joint that connect the lever to the arm, coming down from the trigger.
The 2 trigger "claws" that release the string have a very rough, squared top edge (you can feel it with your fingers), and that chews up the serving faster even with religious lubricating. A flat file and a couple of minutes of careful rounding the said parts can save your serving and ensure smoother string release.
The screw that secure the magazine gets loose with a couple of shots, so needs to be checked/retightened frequently.
Since I use my bolts, and fixed the minor issues, I`m very happy with my Adder. I decided to post this, because I saw some disappointed comments with the Adder in the past week, and I think my findings could shed some light. And 1 more thing: I wouldn`t recommend this platform for hunting.