As for the FAL, is it metric or inch pattern? Metric pattern means cheaper mags.
I have two words for you, they fit both metric and inch guns and are awesome.
MOSES MAGS
Moses Mag | Polymer Magazines
ArmyGuy, metric mags have a bump in the front middle of the magazine, while inch receivers have a rectangle notch that goes all the way across the contact surfaces, and while it is probably the better of the two designs due to surface area where the mag and receiver contacts each other, the Moses Mags I linked above fit in either metric or inch and lock up better than OEM mags altogether and have antitilt followers and are just all out better all around.
Inch receivers also have sandcuts in the bolt carrier, and other little things, and typically dubbed the L1A1. The Inch guns were prior Canadian, Brit, or Australian design. The other 90 something countries that adopted the Fal for service used the Metric design, which is more common and more available due to sheer numbers made.
Personally, I would've never considered selling something that my Dad past on to me.
Whether I already had a similar gun or not would've been beside the point.
Personally, I own a Fal and I think it's the better gun. The HK while more expensive to purchase, is also consequently more expensive to maintain.
Especially when you have to start replacing wear parts. Parts are more difficult to find (only a few vendors for parts are out there). HK's are harder on brass, and from my personal experience, not as accurate either, though may have just been the two specific guns I was comparing with.