Last edited by Stevie808; 01-03-2018 at 12:20 AM.
It'd be nice if some of these rails had cuts in them to allow for the gas block sling loops to stay on the block. I'd like to switch back and forth without worry.
On the one hand, I don't know that I really understand the aversion to wearing gloves if you're going to be doing high volume shooting and training, but that's neither here nor there.
In a general sense, handguards that stay cooler longer do so because they are better at insulating (obviously we're not talking about specialty designs like heat sinks, etc.), meaning that while it might feel more comfortable to your bare hand, it means that it's keeping more heat around your barrel, meaning your barrel stays hotter, longer, and while you may not feel it for a while--your barrel will heat faster and get hotter as you continue to push the weapon beyond its sustained rate of fire. Given that heat is the biggest killer of barrels/guns/critical components, if you're habitually firing large volumes at or near cyclic, you're shortening the service life of the weapon.
Meanwhile, most of the aftermarket rails being discussed may get hotter a little faster than the factory quad rail--but they also offer far superior cooling, meaning that not only do the handguards themselves cool to a comfortable temperature faster, but they also cool the barrel and dissipate heat much better than the factory quad rail, which, in practical terms means a higher sustained rate of fire, which to me is a much larger asset both to serious training and in combat.
Simple volume of fire doesn't necessarily equate to good shooting or good training--I'm not saying that this applies to you, but I know plenty of guys that expend a metric f*ck-ton of ammunition shooting nothing but dirt or maybe old TVs, usually they're civilians who have been fortunate enough to afford machine guns and ammunition to feed them, but have never received any actual training on employing automatic fires.
Ultimately, everyone's threshold for "too hot" will be different, but while I agree that yes, the Geissele (e.g.) handguard can get hot, and all things being equal, it will get hotter faster than the factory quad rail, I don't feel that it gets too hot too quickly, even with bare hands, assuming you're not doing continuous mag dumps or several repetitions of break contact drills--both of which there's a good chance I'd be wearing gloves for anyways. On the other hand, I find the Geissele handguard to be much more comfortable to use/hold and control the weapon, making it worth it to me, despite the fact that the handguard may get a hot a little faster than with the factory quad rail.
Augee is on point here, everything is getting hot by absorbing heat, be it heavy barrel or not, feeling HEAT is good because it shows it is dissipating heat. So your logic is "ok" if you ONLY shoot your three mags, fine, a heavy barrel and enclosed handguard will contain that. But as a rule of thumb, you want the heat dissipation for a longer training drill, because that will keep the gun overall cooler and allow more volume of fire.
Get gloves if thats such a concern, its just the reality.