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An M120 spring would bring you close to the 400 fps mark. However, if you plan on installing a tightbore, you may want to get a lighter spring. My stock 416's spring "settled" to 390 fps (down from 420-430). I was very happy with this. I installed the barrel extender and an M4-length tightbore. Now I'm shooting in the 410-415 range with it. An M110 may be a better choice.
Any good stainless steel tightbore should be fine. I have no idea what brand mine is since I bought it used and the original owner had done the same. I did install a PDI tightbore in my M15 rifle and I'm quite happy with it. A lot of people seem to like the Madbull Black Python as well. I haveone in my Glock 17 and it performs really well. Not the same as an AEG length barrel, but it works well in my pistol.
And thanks to whatever mod cleaned the 'junk' out of this thread.
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