Quoted: Thanks guys, its a new upper with only 120 rounds though it, next time I wont use my 4 cell maglight and magnifying glass on it
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I'll say it... while some do leak and it generally is not a problem... No, they are not supposed to leak. The dimensions do not allow for a loose fit in the hopes that it will eventually plug up and this is something that a good builder shoot check and catch.
So, it will most likely not be a problem, but it certainly is not right... makes you wonder what else is sloppy with the build? Oh well, the firearm industry is weird, you do not get what you pay for all of the time, but you always pay for what you get...