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This is my third geissele gas block that I've purchased and they have all been great. I've pinned one and the other two I used the set screws only. After thousands of rounds they are all still going strong.
This is my second one of these uppers I've ordered. Both have been perfect. You will need a torch to install your barrel and it is a really tight fit. I noticed an immediate accuracy increase when I switch to this upper. Highy recommend it for anyone's next build.
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