You might want to check the DBM's fitting, especially for height. For example in a B&C stock I had to shim the DBM down a bit for perfect fit. In a Hunter 700 stock it fits perfectly. One fella at the range had an AICS DBM. For it to fit in my rifle I would have had to shim down the DBM just a tad for a perfect fit. I"m talking .005" to .020" worth of shims, usually not more. You'll have perfect fit when the bolt travels very close on top of the mag without rubbing against it.