What do you mean by stripper clip guide? There are two things that can be interpreted as stripper clip guides. One is a device that slides over the top of a magazine and allows the rounds of ammunition to be inserted from the stipper clip into the magazine with one push instead of each individual round being loaded one at a time. The other form of stripper clip guide is machined directly into the top of a firearm's receiver and allows the rounds of ammunition to be forced into the firearm's fixed, or non-removeable, magazine, such as what is found on old military mausers. you will also find this on the top of the bolt on simonov type carbines, like the m59, type 56, SKS, etc.
If your talking about loading a AR-15 or a AK-47...go with a LULA Magazine Loader and Unloader. I've used one before and they are really sweat, alittle bit more than the price of 20 stripper clips though...but I bet they would last longer. They also help unloading mags if you need too.