We all know some of the chambers on firearms coming out today leave a lot to be desired! I even found a bump in some pistol chambers where the locking cut had been done. Now, there are many ways to polish chambers, but this is the best I have found:Take a fired case and drill the primer pocket on through using a 13/64" drill bit. Go to the hardware store and buy a 4 13/64" bolt with a lock nut. Push the bolt through from the inside of the hull and tighten down the nut...tight! Clean out the chamber very well with Ed's Red or something similar. Mix up a paste of Flitz and Jewelers Rouge #1. Chuck this in a variable speed drill. Spin out each chamber slowly, reapplying paste on each chamber. You will find this method better than traditional methods since nothing gets into the chamber mouth. You can do the same with rifles by epoxying a piece of an old brass cleaning rod into the drilled out primer pocket. With the paste I've mentioned you will not take out much metal, but it will really iron out those machine marks. This trick also works on shotgun chambers with a fired plastic hull; an Activ hull is best! All of my trap guns were done this way, as were the chambers on my two round-knob Browning A5 Turkey guns.
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