Came across this and picked it up. This one is from Heartland, link to the co. and some vids. https://www.heartlandffa.com/Magazine-p/pmg-217.htm There's another one from Howling Raven but doesnt seem to get as much good feedback. It literally just snaps on/off for the milsurp purists out there. I cycled thru a few mags and works as advertised, nothing better or worse and at $39.99+5s/h is reasonably priced for twice the cap. Strong solid plastic body but i personally would like to see a beefier spring/follower and maybe a stronger retention at the metal tab but it works fine. Maybe a bit fugly but the mag gives it more of a Russian look? lol. Another thing is it definately takes up more room in the safe and the sock wont fit anymore. They say because of the rifle's tolerences  could be a few with some sloppy movement but there are some fixes for that if you want go that route.  Anyway here it is. Guess we'll see how it holds up over time. 

If it was a 20 round mag then they would have something.

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There are others out there...

 

 

 

 

RifleMod did these, which are very well made. No permanent modifications, and these function great.

 

Just something to screw around with.

 

Pretty cool. How does it function? I want one of those K98k trench mags. Also saw recently that there is a way to modify I believe M25 mags for AG42B Ljungman

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Mine works great. Put it on my PU sniper, as it gives me extra rounds between reloading. Normally, I don't run it... was more of a unique thing to put on at the range.

Very well made, and no issues caused by using it as a monopod. The adjustment/fitment is very strong.