Will still leave marks on the magazines
Brownells Feed Lip Tool This simple tool is used to adjust the feed lips on AR15/STANAG magazines. Sometimes the feed lips are bent, too tight, or too loose. There aren't any instructions on how to properly use this tool, but using logic I was able to figure it out. I'd say that this tool isn't totally perfect. It can/will still mar the feed lips slightly especially when opening the lip clearance. It left half-moon markings on the feed lips although there wasn't any physical damage. It is a fairly basic tool, and I'm sure you could make your own using a thick screwdriver and a die grinder to cut the slot. This tool wasn't too expensive, so it was a good and inexpensive addition to my AR15-specific tools. Overall: 4/5 stars, instructions or techniques to assist the user would be great. It still marred my magazines slightly.
