Was doing research into AEG M4 magazines a while back and came across this video. This guy really applied a methodical testing approach and ran a bunch of interesting benchmarks.
https://youtu.be/4ymp_WUvRvA
If you don't want to watch the video, check out this Google Sheets spreadsheet summary:
https://l.facebook.com/l.php?u=https...rYQNASlH2lydvg
I needed to buy five new magazines for a milsim which used real-cap magazine limits. I figured that since I was buying magazines anyway, I could take the opportunity to explore build quality, feed and compatibility by buying a number of different types of magazines.
I own:
- ARES Amoeba 140rd High Grade Mid-Cap Magazine (MAG-AM4-140Sx1-DE)
- CYMA 140rd M4 Metal Mid cap Magazine ( CY-M013)
- G&P 130rd "Ball Ball" Mid-Cap (model GP-MAG007BK)
- Hexmag Airsoft 120rds Polymer Mid-Cap Magazine (model MAG-HMAG-Mag01-ATFG)
- PTS 150rd Mid-Cap Enhanced Polymer Magazine (EPM) (model MAG-PT096450307-BK)
- VFC 120rd Steel Stamped GI Midcap Magazine (model Mag-VFC-M4-120-GR)
- VFC QRS 120 Round Polymer Mid Capacity (model Mag-UX-2273309)
So far the G&P, VFC QRS, PTS EPM, Hexmag and ARES all fit and feed fine, but the G&P is extremely tight in the magwell - needing to be slid in with a lot of pressure - and does not drop out on it's own. I wouldn't recommended this G&P mag for VFC VR16 Saber Carbines due to this tightness in the magwell. On the positive side, there is zero "wobble" in the magazine.
Of the lot, VFC QRS polymer and GI metal magazines seem to fit and feed best, but I would expect that with a VFC AEG. [EDIT] I went and ran about 10 tactical mag drop and reloads with each one, and I take back what I said about the VFCs. See below[/EDIT]
Honestly, if you have a moment, check out that video and spreadsheet. He really does test them, albeit a little unscientifically for my tastes.
The only magazine-related misfeed problems I've encountered so far is when I would try to feed the absolute maximum number of BBs into a CYMA steel magazine. The feed spring gets all jammed up and doesn't feed properly in those. As the poster above indicated, don't overfeed your mags, or better, put in 10 rounds or so less than max, and you won't be in danger of over-compressing the spring.