k20a2/ k20a3 blocks Is there any major dif. in between both of these. I am chatting just the blocks. As in would a K20a2 block be a better choice in sleeving about the A3? The A3 are so low-cost to come by so I just wished to know.Any time you click on an advertisement labelled "#sponsored", we may possibly get paid a commission within the sale. Th