Hey there, what level is the weapon? At level 20, an enhanced intrinsic grants +10 to the chosen stat and + 2 to some others, generally it is all the stats that can be masterworked. So the current Blast Radius instrinsic is giving +10 to Blast Radius, +2 to other stats including Reload Speed. When you switch the intrinsic, you lose the +2 to Reload Speed that Blast Radius was giving, and gain +10 from the Reload Speed intrinsic. So that's a net gain of +8. Similarly, Blast Radius loses 10, but gains 2, for a net loss of 8. Other stats are unchanged, they're either getting +2 or they are getting 0.