Originally Posted by Phaedrus2129
Springs are easily bought, but flatsprings of the correct dimensions and specifications to be used in a magazine aren't. And coil springs are generally unsuitable for magazines.
The lower receiver of an AR-15 is the part of the gun that experiences the *least* amount of stress when firing. All it has to do is stand up to recoil, and it can't even do that for 100 rounds. And .223 barely has recoil! And you want to try to say that a magazine made this way will hold up to the stress of rounds being stripped off the top, rounds pushing against the feed lips from below, and a strong spring pushing against the bottom of the mag, and that it won't
immediately deform? Sure, ok.
Printed AR-15 lower can't withstand 100 rounds? You are far behind the times. Go look it up, there are printed lowers withstand over 1,000
rounds and still not breaking.
Same for the magazines, they started out as crap, but are progressing and are surviving over 100 rounds before they become too deformed to use. Seriously, go catch up on the subject and quit acting like it's this time last year when this stuff couldn't hold up. It's come a long way.
Here's a link for 660 rounds ( first link that popped up on Google, I'm not doing all of your research for you ) and the lower being just fine ( they ran out of ammo according to the article ). And it is about Defense Distributed which has been at the forefront of printing guns ( same guy that made the liberator ). Also speaks briefly of their magazines for AR-15's and AK-47's, but more detailed articles and even videos can be found all over. But yes, the magazines they're printing are surviving upwards and sometimes even over 100 rounds with ease and they're only getting better.
The lower is all that matters, it IS the gun by definition of the law. If you can print a lower you can go buy the rest of the parts off the shelf ( aside from high capacity magazines of course, until the printed variants get better at least ). There is no reason for a fully printed gun, the point is to circumvent traditional gun regulation and that is done with no more than the lower. And there will always be some kind of metal at least in the foreseeable future so it won't circumvent traditional security checks. They aren't a threat, not any more than traditional weapons are that are just as easily obtainable.Edited by Shrak - 7/29/13 at 8:03am