Dumbass move of the day: stripped hex head bolt on my DD slim keymod `
http://images.tapatalk-cdn.com/15/12...9d4ad27299.jpghttp://images.tapatalk-cdn.com/15/12...e4589e2072.jpg
I am assuming this is the rail and that it's one of those 4 hex bolts that screw in towards or away from the receiver. If so, good luck! Those look difficult to get at with standard tools. My usual "go-to" is a torx bit in these situations. I have a torx wrench that looks like an Allan key (L shaped). That might be your best option in this case.
Also, depending on how it would work out, it looks like you could drill the head of the bolt off and use a vice and some grips to get the rest of the bolt out. Both pieces the bolt goes through will not be threaded (only one), so if you drill the head off, the rail should come apart. Either way you need a new bolt.
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