I finally get around to installing Kip's rail on my M4 . Have had the gun and rail for months and everything has just sat in my safe because I have been so busy . Gun NIB and rail NIB . Before I even got into this I called Benelli and asked if they could ship me new rail screws because out of the box two screws were chewwed up alittle from them not using the right size screw driver when installing the factory rail . It looked as if the driver slipped out of the slot and left some marks on the top side of the screws . Only 2 of them . They said no problem and took my serial # . So I put the M4 in my Tipton gun vise and took off factory rail . I look at the M4 and from the factory one of the screws chewwed up the top of the reciever when they installed the factory rail . Lots of bare aluminum showing were the screw was trying to go into the reciever . I am a total anal freak zoid and this was bothering me but said WTF am I to do now . I figured it would be under the new rail and I would never see it so I let it go althought I will always know its under there . So now I am putting on the new rail with all new hardwear including the lock washers also that Benelli sent . I start the screws buy hand and everything was fine with 3 of them . 2 of them wont go more than a thread or 2 and then start to bind up a little . I take the other screws out and take off the rail . The bolt is out so I look into the screw holes with my Surefire and all looks good . So I blow everything out with compressed air . I try again and same thing . I even try the old screws , no go . So 3 screws are fine but 2 are binding up a slight bit . After screwing the 2 bad ones in and out a few times just to make sure I am in the threads perfectly I decide to just screw them in and they end up going in fine until ever so lightly start to get tight . So now all 5 screws are in and I had put blue Lock Tite on the threads so I want to just snug them up all the same . With just 3 fingers on my screwdriver I snug up all 5 screws and 2 of them felt as if they were about to strip . I can't believe it . What a complete nightmare . I have worked on my bikes , cars , trucks , motorcycles , boat , guns , knives everything I have ever owned since I was a kid . I am totally anal and careful , it was just like surgery for my M4 and then all this . I couldn't take it and sold the gun without ever firing it . I am getting another but am terrified to take the rail off this 1 because of what may happen . Beside that Kip hasn't had rails in forever . Any one else ever have issues with there M4 from the factory ? For this kind of money everything should be perfect from the factory .