If you insert the magazine with the action open(bolt rearward) does it over insert and block the bolt from closing the action?
Doesn't seem to for me, but I've heard of other people who have had feeding issues when there's upwards pressure on the magazine. Here's a video where I do my best to get the bolt to jam on a loaded magazine (with unprimed dummy rounds) by pressing up on the back to tilt it into the bolt face. I push up on the bolt to tilt it down and give it the best chance of jamming, but while there's a noticeable sticking point it goes into battery just fine. It also feeds when I put pressure on the front on the magazine to tilt it in the other direction, and while it increases friction there is no sticking point.
When my MDT magazines come in I'll see if it's any different with those. The 5 and 10 round magazines I currently have in my possession are all Magpul so I'm eager to see how those ones fare.
Nice bike you have
Thanks! I made the rifle holder when I saw some ATV clamps on the discount/returns rack at Canadian Tire and decided to see if I could kludge something together for my fatbike. It's heavy and ugly, but it gets the job done. Since it goes around the magazine well this would be a good use case for a flush magazine, but I'm pretty sure a bicycle counts as a vehicle for the purposes of transporting a loaded firearm, hahah.

