I just bought a used micromag from a shop and I took it home and my freak back screws like halfway in then stops...I'm pretty sure its the micro's threads but i'm not sure. Do any of you guys have the same problem? I'm supposed to bring it back into the shop for them to check it out but i don't know if its my freak back, it screws in perfectly for other guns so if you know what's happening please let me know, thanx.

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