You are really worried we can’t get 34 Senators to kill the Small Arms Treaty?
If, after that, you think that it takes at least 67 Senators to ratify a treaty, I'll bet you $1,000 to FreeRepublic.com that you are dead wrong. A treaty can be ratified with as few as 34 Senators. In fact, it may have been done in the past with considerably fewer.
Simple majority