I currently have the kwik klip conversion on my 700 in 270 win. Overall I thought it was a very good kit for the price. I originally had an ADL and bought a BDL stock and this kit. I thought having just a magazine to take out after a hunt would be a lot easier than running all the ammo through the chamber. Plus I thought having a 10 round mag would be wicked cool
, but pointless for the type of hunting I do.
I only have one major and two minor complaints about the product. First off it does reduce OAL, not by much but enough that I have to shorten my reloads to where my groups go from sub moa to almost 2 moa at 100 yards. This is why I'm currently looking at converting it back to an ADL. Second, the clip does rattle when it is empty and placed in the gun. In reality this will never be a problem since there should always be at least 1 cartridge in the mag and if there isn't, well I think my cover is blown after the first 5 shots. This minor complaint is more about build quality. In general products with high build quality have tighter tolerances, but this doesn't effect the function of the clip. The last minor complaint is that it required more than minor inletting on my part. This could have been since I installed it on a Boyd's aftermarket stock, but I had to remove material in front of the magazine and along the sides for it to fit. Furthermore if you look on Cabela's website it says "Minor inletting required for 700 ADL". Somehow punching a large hole through the bottom of your stock and then taking out additional material on the bottom to me doesn't qualify as "minor inletting".
The longest OAL I can fit in the mag and reliably feed is 3.325. The suggested OAL for 6.5x55 is 3.149 so unless your lands start halfway down the barrel you should be fine. Just as reference the suggested OAL on 270 win is 3.340, which couldn't even fit inside of this magazine!
As to whether this kit will physically fit in your DM stock, I couldn't say for sure. I think I've heard of guys converting the DM to a BDL by just replacing the trigger guard and in that case it should work minus the minor cosmetic defect. If you have a buddy that has a BDL just ask to barrow his trigger guard and try it on yours. Hope this helps.