Hello. I've been researching the Spartan Upper Receiver from Tactilite for 50BMG. It's fairly new so there's not much out on this particular receiver but is there anyone who could tell me about it, or their experience with tactilite? I'd like to know, how much difference is there between a 24-29" barrel? They offer 18-24-29. I'm new to all this, but I wanted to know about this upper receiver. This will be my first large caliber rifle. I have only ar-10s at this point.
