Cyma mp5k

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Hi all, I bought an aeg cyma mp5k as a backup for my srs from “just airsoft” and am having problems with the mags. The 68rd one it came with works fine but I need a higher capacity (ideally mid caps). The problem is that i bought a 560rd one (also a cyma brand) but it does not lock in place. Comparing the two there a couple of minor differences but the main bit seems that the mag is came with has wider feed lips. Is this a common problem for cyma mp5k users? Any help would be massively appreciated!
 

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It looks to me like the lugs on the back of the mag that prevent you from over inserting are stopping the bigger mag from seating properly:

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If the top of the mag catch cutout is level across the two mags the lugs on the hicap look to be higher up. I'd suggest either slapping the fuck out of it and seeing if it'll go in or just taking a small file to the top edge of the lugs to give you a bit more room to manoeuvre.
 
It looks to me like the lugs on the back of the mag that prevent you from over inserting are stopping the bigger mag from seating properly:

View attachment 5137

If the top of the mag catch cutout is level across the two mags the lugs on the hicap look to be higher up. I'd suggest either slapping the fuck out of it and seeing if it'll go in or just taking a small file to the top edge of the lugs to give you a bit more room to manoeuvre.
Thank you- I did try but no luck. Took the mp5k to my local crawley surplus and their normal cyma mid caps mags fitted fine! The lads there think maybe the hi cap i got was for the blue ed/ platinum’s only but I have no idea?!
 
All good now as my ghillie backup. Got to trial the flare gun and ballistic knife a mate made that take gas shells too 😎
 

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