TJ's 1911 Series '80 to '70 Shims replace the gap used by the Colt Series '80 Firing Pin Block Parts.
Below you can see all the Colt Series '80 Firing Pin Block Parts that are replaced by the "TJ Series '80 to '70 Shim"
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It is nessessary to fill this frame gap so the sear will not wander over and lock up the entire trigger mechanism.
