Hey all, I've had an Urban for about a year and love everything about it except for the $50 magazines. The recent acquisition of a 3D printer has opened up new horizons in airgun accessories for me, with the most challenge being designing a replacement magazine. After several prototypes I've settled on one that works very well. Some things of note:
-It only holds 9 rounds, but will not allow you to close the bolt on an empty chamber. With the factory mag, I would frequently loose count of my shots and end up dry-firing on the "11th" shot. This design prevents that from happening.
-It currently does not have a magnet. I have some neodymium magnets on order, but until now the blue masking tape provides a secure friction fit. The friction fit works well enough that I'm considering just adding a bit more thickness to the mag and forgetting about the magnet altogether.
-The spring tension is significantly stiffer than the original. This doesn't cause any problems, but is noticeable when loading.
-Loading is a bit different than the original. My design does not use an o-ring to hold in pellets while loading, which means you have to hold a fingertip under the opening to prevent pellets from just dropping all the way through. Also, sometimes you have to give the mag a little shake to get it to rotate to the next opening. With 5 minutes of practice I can load these just as fast as the original.
Overall, I'm pretty proud of myself on these. They're not quite as refined as the original, but feed flawlessly and sure cost a lot less!
I've also designed and printed a "pickle" core that has demonstrated a 5 decibel reduction in muzzle report. More to follow on this project in a separate post.
-It only holds 9 rounds, but will not allow you to close the bolt on an empty chamber. With the factory mag, I would frequently loose count of my shots and end up dry-firing on the "11th" shot. This design prevents that from happening.
-It currently does not have a magnet. I have some neodymium magnets on order, but until now the blue masking tape provides a secure friction fit. The friction fit works well enough that I'm considering just adding a bit more thickness to the mag and forgetting about the magnet altogether.
-The spring tension is significantly stiffer than the original. This doesn't cause any problems, but is noticeable when loading.
-Loading is a bit different than the original. My design does not use an o-ring to hold in pellets while loading, which means you have to hold a fingertip under the opening to prevent pellets from just dropping all the way through. Also, sometimes you have to give the mag a little shake to get it to rotate to the next opening. With 5 minutes of practice I can load these just as fast as the original.
Overall, I'm pretty proud of myself on these. They're not quite as refined as the original, but feed flawlessly and sure cost a lot less!
I've also designed and printed a "pickle" core that has demonstrated a 5 decibel reduction in muzzle report. More to follow on this project in a separate post.
