HK G3 mags

[Signguy69]

How do I covert HK magazines from 20 to 10 rounds? Websites?

[strongpoint]

http://www.magazineblocks.com/magento/products/magblock-kits/hk/g3-and-hk91-10-20-magblock.html

[ptoguy2002]

The mag block ones above IMHO are the best option from a functional point of view, as they go inside the spring and don't preload the mag spring. They are more finicky to actually put together though.

There are also these: http://www.hkparts.net/shop/pc/HKG3-...d-111p2443.htm
(which are radlock so you might get them elsewhere)
These are IMHO higher quality and probably easier to put together, but do preload the mag spring.
Don't forget drills/rivets/epoxy.

hkparts.net also has cut down 10 round mags, but they are pricey.