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if you have a freak barrel, you should lube the two o-rings that hold the insert in place. It makes it much easier to slide the insert in and out. If you let it get too dry, it will be very difficult to remove the insert. I found that out the hard way lol. As for o-rings on the end of barrel threads, i would leave those unlubed. It helps keep the barrel on there snugly.
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