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Old 06-04-2014, 01:40 PM   #1 (permalink)
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FS rounds in Horizontal Spring feed?

Has anyone tried?
I was wondering if the FS would properly orientate themselves or get stuck

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Old 06-04-2014, 02:16 PM   #2 (permalink)
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In the gun you posted a picture of, I don't see how it would work. At best, they would enter the breach pointing up/down. Then jam/chop when the bolt comes forward.
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Old 06-04-2014, 02:23 PM   #3 (permalink)
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I think you're saying horizontal and bore-line, as opposed to horizontal and perpendicular to the bore-line. I often considered that question, but I can't see it happening without partitioning in the feed tube and some sort of loader mechanism. The rounds stack inside each other so well that I don't think you can hope to get them to separate reasonably by themselves.

Something like an ATS chain on a torsion spring would get the rounds to the chamber, but you may need a pair of tippmann F/A-ish fingers to get it set right.

Some 3/4" square tubing would make the mag tube with room for some tension wire or guides. The problem is re-orienting the round (imo).
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Old 06-04-2014, 03:59 PM   #4 (permalink)
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Ah. I see now. It won't work.
I didn't know that FS had recessed space on the back.
Fubarius had a interesting design. Has there been any further development?

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Old 06-04-2014, 04:05 PM   #5 (permalink)
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Yeah with out using some sort of reverse "lifter" like you find on lever guns or shotguns, then you need to go with something Like Fubarius is working on... even then, the FRS needs to drop in perfectly and not stovepipe. I almost think flipping the FSR's 180 degrees in his feed may work better.... have the skirts push the FSR around the corner and into the gun.. it may seem clunkier, but that is the end that will hang up.

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Old 06-04-2014, 04:25 PM   #6 (permalink)
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I can't tell you how many times I've seen that Fubarius pic, with zero followup regarding whether or not it actually worked. I think we should all just refrain from posting it until he comes back with some followup. My impression is it won't work.

I've been trying to draw a helical feed path similar to a P90 mechanism to see if it would work on FSR's, but it keeps breaking the CAD tool for some reason. Otherwise I'd 3d print one up and test it out.
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Old 06-04-2014, 04:40 PM   #7 (permalink)
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I think it is a little "telling" that FN used a drum feed on the FN303. I'm wondering what the timeline was between that and the FN P90 feed that has the rotating drop block on the magazine.
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Old 06-04-2014, 05:33 PM   #8 (permalink)
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Quote:
Originally Posted by Badger View Post
Ah. I see now. It won't work.
I didn't know that FS had recessed space on the back.
Fubarius had a interesting design. Has there been any further development?

http://fubarius.com/pictures/buildoff/mag21.JPG
Work had to be halted due to a lack of material. It was a for fun side project at work, using up some old scrap 3/4" thick HDPE plastic we had for another job, and I completely ran out of the stuff. I looked into picking up more on my own, but the cost was a bit excessive (a couple hundred bucks a sheet at least).

The good news is that a recent job needed that exact material and I have a bunch of scrap stashed away to continue my little experiment. Unfortunately we're really busy, and the boss frowns on non-pay work interrupting pay jobs. If we slow down again I'll see if I can whip up a few more functional variations.

The big flaw in the posted version was the loading port. The darn spring wanted to shoot out of it with a full load. I either have to come up with some sort of flap to close it off (kind of hard with my available setup at work), or just remove the loading port and load it some other way. Maybe just mount it to a Model98 (with D shaped feed port) and just hinge the feed down to load after locking the spring forward.

It really was just a proof of concept, to see if the rounds could rotate around a corner. That they do. It was just all the other little details of making a magazine that hung me up. I was hoping that someone else would get inspired and run with the idea.
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Old 06-04-2014, 05:59 PM   #9 (permalink)
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I was hoping that someone else would get inspired and run with the idea.
I inspired, I run! I've already been working on my own version of it as one component for a much larger build... But likewise time constraints mean I probably won't have a finished product until sometime this fall/winter.
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Old 06-04-2014, 09:52 PM   #10 (permalink)
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Well I'm impressed that it would actually feed then. Didn't look like it would work. Course now that REALLY makes me wonder if the P90 helical twist will work.

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I think it is a little "telling" that FN used a drum feed on the FN303. I'm wondering what the timeline was between that and the FN P90 feed that has the rotating drop block on the magazine.
About as telling as the fact that they didn't use a linear magazine either. That is... probably not at all. It could have been a totally different set of people working on the stuff. Seems like it's too difficult to speculate.
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