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Replacing Barrel oring

I use a wood dowel from the muzzle end, I have a clamp on the dowel , so it stops when it is flush with the o-ring groove edge.
fold the o-ring and shove it in the breech end and then use the dowel to push back on it, as you use something short (like an allen wrench) on the breech end to force/nudge the little burger in to the groove, work it back and forth a little, pre-lube with silly-con oil,,, forgive my humor
 
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I tried a warm patch kit it worked great on my 30 cal, I am going to try it on some of the other calibers I will make a video, just fine the caliber you need and put it in where you put the pellets in and push the oring in and slowly pull the warm out oring falls in place

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