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You could've just gotten a No. 2A. And put that in the weep hole, where it was designed for the gas to come out. But since TM M14 is not gas powered, you don't have to worry about that.
Read this article:
http://www.thefiringline.com/forums/...ad.php?t=98465
They also teach you to just drill a hole, and put in the No. 2A, then use epoxy.
I'm putting mine into that weep hole like Blastyman did.
If you want to use the number No. 6 and No. 6A or the No. 2. Some modifications has to be done like the one in the article.
Read this following article
http://home.hawaii.rr.com/dighawaii/...%20Version.htm
I'd go for the easy way, to just take advantage of the weep hole.
I found most of information I need, hehe.