I covered several field expedient "quick pulls" versions on page two of the Magpul manual- Yep they were around long before I produced the Magpul, I just got fed up with scraping duct tape off my mags and having to spend an hour to para cord 10 mags.
Zip-Ties covered with gutted 550 cord are probably the best handmade magazine pulls that I tried while in the Military.
Just a few pointers though-
1. Don't use the zip ties with the metal locking tooth. These are stronger than regular zip ties but the metal rusts and they will fail suddenly.
2. Once you have the loop sized to you liking, duct tape the zip tie forward of the lock so that it will not click smaller and smaller during usage.
3. Use black zip ties- trust me the white is very bright under some lighting conditions.
4. Try and get the zip tie to be sandwiched between the floorplate and the mag-spring. This stops the shifting of the loop and ensures that the ziptie does not interfere with the spring operation.
5. The floorplate should be able to take the stress of the pull as shown in jrzy's example. But as I point out in the Magpul manual, looping from front to back through the drainage hold has been known to pull the whole floorplate off.
If used with a compatible pouch the Magpul is far more versatile IMHO. But then again I am biased. ;-)
[img]http://www.magpul.com/pictures/magpul556_2_195w.jpg[/img]
The Magpul can be installed in under 30 seconds and moved just as quickly from Mag to Mag.
Each loop is in the exact same place and length from mag to mag promoting reflex training and the recessed rough texturing allows for more positive control when wet.
The Magpul offers more protection to the magazine when dropped and does not use glue or tape to attach.
The Magpul can also be color coded to id ammunition type and modified for identification by touch only (tracer light v.s. tracer heavy)