Hi-Power magazine differences?

[Northwet]

Just what is the internal difference between the Hi-Power 10-round and hi-capacity magazines? Is it just different springs, perhaps with a spacer?
Reason I'm asking is that my ordered FN Hi-Power SFS is coming with three 10-round magazines. If it's simply a spring swap (Wolff?), great. Otherwise the magazines won't get much use and I'll be spending some more bucks for 13-round mags.
North"wet"
Altus, OK

 

[grimjaw]

I think the 10 round mags have a spacer at the bottom, I don't think it's just springs. For fun, pick up the MecGar 20 rounders. They aren't that much more expensive, and have proved reliable for me during practice sessions.

jmm

 

[Car Knocker]

Yup, there's a plastic piece below the shortened sheetmetal of the mag.

 

[Hawk]

...and the plastic spacer incorporates a "rat trap" spring that provides drop free operation with the mag safety still in place.

One of the few cases of making lemonaide out of the '94AWB. I prefer the 10 rounders in my BHP with the mag disconnect and MecGar 15's in the tuned BHP.