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7/21/2025 10:14:13 PM EST
The factory aluminum FN mag that came with it fits way to snugly, to the point of almost not being able to insert and almost impossible to remove. Pmags have the same issue. Anyone else ran into this? I very rarely run mags in it, but a range I sometimes go to has weird rules and links and steel cased ammo.
HK 416/SA80 mags fit and run perfectly btw, not a single hiccup or lip damage.
7/21/2025 10:17:51 PM EST
[#1]
Yes, fairly normal for an M249, as I understand it.  The ability to feed using standard mags was secondary and only intended to be used as an emergency option.
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7/21/2025 10:27:36 PM EST
[#2]
Never had an issue with usgi mag fitment in many 249s.


But, if you want more mags, hkparts has windowed hk magpuls for $9.
Seriously, a tractor dealer from Possum Trot, KY has to explain this to you, a lawyer? - JPL

WTB: Glock 17 gen 2. SN CAF 895

Win if you can, lose if you must, but always look good for the crowd.
7/21/2025 10:32:34 PM EST
[#3]
When they were issued, the mags would not seat properly. They were never intended to run with a mag. You don't see an M14 mag well on an M60, do you?

Congress, comprised of half-wits, shit heads, cunts, and fools, decreed that the M249 must run a STANAG mag before they would sign off on the acquisition. FN complied, but not well.

In order to run that mag, you insert it, then use your left hand to cant it forward juuust sooo, then it might feed. The necessity for a mag run SAW in combat has come up exactly zero times since the M249 was adopted.

Get you some M27 links, and run that puppy like the Belgians meant it to.
7/21/2025 11:11:44 PM EST
[#4]
Use an FNC steel mag.  This mag was OEM for the FN 249 and will also function it with full 30 rounds as opposed to the necessity of downloading the 28 rounds on the G.I. mags.

H&K steel mags will also work and fit well.


18Z50…. Your friendly 18 bravo.
8/6/2025 10:51:02 PM EST
[#5]
Issued ones worked fine with live ammo and only so-so with blanks
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8/7/2025 11:44:25 PM EST
[#6]
My 249S has over 1000 through it with GI magazines and has been 100% reliable.  I've never experienced a tight magazine either.  At the price I paid, if it were any less, I'd be demanding a new rifle.
8/10/2025 8:39:12 AM EST
[#7]
Using brand new aluminum USGI mags I never had any issues feeding the SAW.
"An unarmed man can only flee from evil, and evil is not overcome by fleeing from it." --Col. Jeff Cooper
8/10/2025 8:39:59 AM EST
[Last Edit: Miles_Urbanus][Edited] [#8]
Quote History
Originally Posted By ProbableColtAddict:
My 249S has over 1000 through it with GI magazines and has been 100% reliable.  I've never experienced a tight magazine either.  At the price I paid, if it were any less, I'd be demanding a new rifle.
View Quote



The issue is in full auto M16 magazines with weakened old springs can’t keep up with the ROF. Being a semi SAW helps with that.
"An unarmed man can only flee from evil, and evil is not overcome by fleeing from it." --Col. Jeff Cooper
8/10/2025 7:24:48 PM EST
[#9]
No issues using my FN steel mag although my preference is the nutsack for to feed.
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