The weakest cross section of any stock is usually through the recoil lug area. Next weakest is through the sides on each side of the magazine box inlet. Extending the stock material around that area increases rigidity and strength to an otherwise weak point. The SENTINEL stocks are also about 0.150" wider from side to side where the action resides. Again to get away from areas that may be a little thin once finished. The IMB chassis insert also helps build in extra strength on the stock as well.
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A KMW rifle was in a case in the trunk of this unit that was hit by a drunk driver. Case, rifle and most of the rear of the car exploded in different directions. Case had secondary impact then the separated rifle got slammed one last time. The stock was fractured in multiple places but the rifle was still functional and the NF scope was still operable. This was the last of 3 similar incidents that I am aware of where one of our rifles was in a crash and survived pretty much intact. I have this stock at the shop as a reminder of how tough they can be.
Also, the balance point of most rifles in this stock is on that flat right in front of the magazine. That flat mates quite nicely when the rifles are mounted into RRS VYCE or Pig/Hog Saddles on tripods.
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Also, any rifle you are going to work with had better lend itself to positional shooting. The same "belly" gives another option for hand position when trying to build good skeletal support into your position.
When in elevated positions that have you in high angle attitudes with the rifle, the sloped front of the belly can be pushed into the edge of the deck, rail, etc. and the rifle pretty much balances nicely with or without a bag there and still lets you push into the rifle.
The design came from attempts to be hand friendly in many types of setups. thus a lot of curves and merged lines. Most new gen chassis and stocks optimized for PRS barricades, etc. have perfectly straight line and edges that aren't ergo friendly if the shooter is the one stuck trying to support the rifle.
I would still recommend you getting a sample of your main considerations to handle. You will quickly find a favorite for your own type of use. You guys may handle the KMW and decide it totally sucks but at least you will be spending money on something else knowing you tried to make an informed decision. It is a buyers market right now and you are in a good position to choose from a lot of good products.
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