The G36 is what I carry when I'm not hoofing a J-frame .357.
After a slight foopah with an extended slide stop release, the installation of which caused much consternation, gnashing of teeth and jams, before I learned that the part was inconsistant with the G36 design and switched it back to stock, I have had nothing but success with the weapon!!
I took it to the range last Saturday and put another 100 flawless rounds through it.
Mine has Trijicon night sights, minus connector, reduced power trigger spring, and is currently loaded with 185gr Silver Tip.
I have found, however, the it has feed problems with Cor-Bon ammo.
But, I understand that it is a common malady with the gun.
I would not recommend firing to many +P rounds through it, 'cause yer hand is gunna hurt afterward!!
As touching holsters, I have carried it on the ankle, pocket, belt and IWB. The Bianchi Black Widow, covered with a loose t-shirt is my prefered method of carry.
Magazines can be had from Ivanhoe's Warehouse Outlet for $16 ea. with free shipping when you buy two or more.
http://www.ivanhoeoutlet.com/
The '36 is on the right and the '30 is on the left.