Chuck, The main beam mounts to the top rib and are used to measure the length of pull, drop at comb, drop at heel and pitch. The stock on try guns are fully adjustable by the use of thumb screws on the comb and length. The t-wrench is used to lock the adjusting screws once everything has been set.
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"Much care is bestowed to make it what the Sportsman needs-a good gun"-Charles Parker
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