I use 23g 1 1/2" pins for the quads, but I don't put the pin all the way in. I only use about 1" for quads.
Have you injected test in your quads before? If not, you may want to rethink that plan. I learned this lesson the hard way. Many years ago I injected test into my quad and could hardly walk for days. I will inject deca, eq, and winny into my quads....but now all of the test goes into my glutes.