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August 28, 2019, 12:05 PM | #1 |
Junior Member
Join Date: June 22, 2019
Posts: 12
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Why does a .350 legend cartridge not properly fit in standard AR-15 mags?
I've asked this question to people at Winchester via mail and I haven't heard from them yet.
Basically, .350 Legend is a straightened version of .223 Rem/5.56 Nato. So when I firstly saw the cartridge being introduced, I thought it would stack pretty well into already mass-produced AR-15 mags. However, the reality was different from what I thought and people say standard AR mags don't always work well with the newborn cartridge. So I made a hypothesis(?) that it's due to .350 Legend being slightly thicker than .223 Rem/5.56 Nato at the base (0.39 vs 0.376" in diameter)-thicker base means less room for another cartridge to be stacked when there is at least one already in the mag. What are your opinions on the mag compatibility problem and my hypothesis? |
August 28, 2019, 01:41 PM | #2 |
Senior Member
Join Date: February 13, 2002
Location: Canada
Posts: 12,453
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The Legend(looks like a .30 Carbine on steroids) probably uses a different follower. I'm not seeing anything on any of the sites touting the Legend that even mention the AR other than Ruger chambering the AR-556 in it. It's more of a short range specific deer cartridge than an AR cartridge.
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August 28, 2019, 02:13 PM | #3 |
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Join Date: October 16, 2014
Location: Iowa
Posts: 1,634
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After reading a few other forums it sounds like the forward rib in the standard AR magazine is what causes the most issues. This can also cause problems with 300 Blackout depending on the bullet / magazine combo. With the little .223 bullet it doesn't cause any issues, with the .308 bullet it might cause a problem, with the .357 diameter bullet you need a magazine with the rib removed.
With a plastic magazine and the appropriate tool it could probably be done easily. |
August 28, 2019, 08:23 PM | #4 | |
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Join Date: April 13, 2013
Posts: 324
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Quote:
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August 28, 2019, 08:44 PM | #5 | |
Senior Member
Join Date: August 25, 2008
Location: In the valley above the plain
Posts: 13,424
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Quote:
.350 Legend cannot be made from .223/5.56. Therefore, it is unique. The reasons why it doesn't play nicely in some magazines have been addressed. Forward ribs 'squeeze' the cartridges at the front of the mag and screw up the geometry - especially in magazines that have 'slots' for the bullets to ride in. The larger base isn't really an issue. If it was, cartridges like .458 SOCOM would need bespoke magazines (like .450 Bushmaster...).
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September 5, 2019, 07:53 AM | #6 |
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Join Date: July 17, 2011
Posts: 124
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The front rib restricts it and its also a tad longer than my 300 ammo. I was thinking of trimming one of my 300 mags to have an extra mag. Since I have several 300 mags and only one 350 mag. But in retrospect, I will just buy an extra mag.
PS my 300 ammo will run through a standard 223/5.56 20rd steel mag. But rubs the front rib Last edited by Sergeant; September 5, 2019 at 07:56 AM. Reason: Add info |
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