How much could I have a stainless barrel turned down before losing accuracy?  I know it will heat up faster with the thinner profile but this will mainly be used as a slow bench shooter anyways so that doesn't matter too much to me.

I also have an SPR for longer ranges and better accuracy.  Really just looking for something lighter weight that will offer more accuracy than a standard chrome-lined barrel.

Thanks...

I have a SS 16" that is 1-8tw wylde chambered, it is cut to m4 profile with a knights ff quad rail. The rifle shoots 3/4" groups with decent ammo.
had one in the past basic same set up but was carbine gov. light weight that rendered the same basic results(I regret the sale).

Good to hear that you didn't see any negative effects on accuracy with the different profiles.  

I was actually thinking about going with the true LW profile (.625) if it would all end up the same.  Mine is also a 16" w/ a 1/8 twist.

Anyone else?

I was thinking of just sending it to Adco and seeing what they suggested...