While the outer barrel is purely cosmetic, the breach on the LS (and I'm assuming the same can be said for the recon) is very snug. For this reason, without creating a new breach, modded streamline darts are going to be a better fit and fire further out of the gun than micro stefans, which are too tight in the inner barrel. If you want to get similar range out of stefans you have to compensate for the tight fit by increasing the air flow (stronger spring combination) or replacing the breach with one that fits your darts better (FA's Brass breach).
In a rare appearance, and an even more rare act of forum moderation, I've moved this topic to General Nerf, since it has absolutely nothing to do with Modification.
Holy ass fuck on a habachi Batman!
VACC