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Hey guys picked up an M4 CQB and seems to run great the only problem I can see is that the white plastic spacer for the guide rod is missing... I guess someone along the way subscribed to thenooblord advice and removed it! Are replacements available for these or do I have to rig something up? I read that without this I run the risk of crunching my valve...
Also I read somewhere that polishing the brass tube increases performance by reducing drag on the bolt any suggestions on what works best to accomplish this.
Thanks
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