Quoted:
Quoted: OK, next stupid question. Why not 29? Why 28?
Do the 20 rd mags have the same problem? IE, you load 18 or 19?
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28 is an even number and provides a little more "slack" in the spring. 29 would work and some people load to 29. I load my 20rd mags to 20rds.
TS
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When I load to 28, this number allows for a quick visual- a magazine loaded to 30rd capacity has the first round resting on the right hand feed lip. (When viewing the magazine from the rear) With 29 rounds loaded, the first round would rest on the the left hand feed lip.
I load mostly 30 rds, but some of my mags are new with stiff springs which I'll load to 28 just to confuse the hell out of myself while ensuring easier seating in the weapon. If I see a magazine with the top round against the left hand feed lip, I automatically assume it's a partial and not a "full" load of 28 or 30.... While one could always use the weight to further determine if the magazine is near full, as I said, this is just a visual aid.
HTH
Sly
ETA: The controversy of dowloading seems a problem only relative to 30rd mags. USGI 20s are good to go.
Unless the spring is installed incorrectly.