I must admit that I am disappointed by how "reforging" works. Destiny's Programmers had an opportunity to do it right and they blew it. They could have made it so that one could lock a particular perk and continue "reforging" for the perfect combo but no, they took the easy, lazy and unimaginative way!
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No, they took the way that doesn't allow "cherry-picking" to get a gun with all the best perks. They made it a gamble so that you have to make concessions.