So it seems like you probably got a 45 rnd mag so forget all the winding posts I made
now you will need a speed loader:
bit of a bummer - jeez they could of shoved in a cheapo few quid one like pic (90rnds or so for pistols/sniper)
or you buy a higher capacity loader like this:
or you can buy a hi cap mag with wheel:
though it "should be compatible" but this is not always the case
Now if you can force the bb's into the low cap one by one - bit tricky but can be done - very tedious
is there a tube/rod - had something like that to fill a crappy spring famas
very crude but did work - avoid famas springer - the tube/rod is about the only good thing left working on that
I ask where abouts are you - reason being you might want to take gun with you to a local shop for a new mag
most mags do work ok - some ak mags might need a tiny bit of modding on certain guns/mags
this is not always the case - but on occasions some ak's may not fit or click into place on every gun
hence me asking where you are based - you could try a store or even a local site with a shop
bring gun - test mag fits etc - or you buy a loader or take a chance and buy mag online
bummer - but you should be able to force in a dozen or so bb's to test the gun out
you need at least 6 - maybe a dozen coz at least the last 3 or 4 bb's will not feed
yeah you should be able to jam some bb's in there for a few shots - PITA but should get a play with it