Hey guys, planning a new build, and was just wondering what really makes an SPR an SPR? I mean I get that its accurrized for the designated LD hitter, but does it come in 18" 20" 16" or what? Are they always stainless barrels? 1x8 or 1x7 twist? Is there a form I need to follow? Should I just make an 18" precision oriented build? What types of optics are they usually outfitted with? Are gripods mandatory or passe? Halp.