I have a savage model 12 low profile varmiter action. I put a new weaver 20 minute one piece base on it and everything matched up perfectly. After I put it on and tightened it up we dropped a strait edge across the base and it had a bow in it. To me this shouldn't make any sense because when I dropped the strait edge across the bare action everything is perfectly strait.

When laying the strait edge on the front of the base at the front of the receiver their is roughly a 1/16th inch gap at the rear of the base indicating to me that the base is torqued in the middle causing the gap at the rear of the base. If the process is reversed then it shows up as a 1/16th gap at the front of the base. The total length of the base is 7 inches.

I am not an inexperienced shooter but this doesn't make any sense to me. I have never had a situation like this before. Does anyone out there know or have any bright ideas on what the problem is or how to fix it short of buying another base and still possibly having the same problem.