The Ruger Gunsite Scout Rifle, or GSR for short, is a Model 77 rifle that has been reconfigured into the Scout rifle concept as envisioned by Colonel Jeff Cooper. The Scout rifle concept is simple: a .308 bolt action rifle with a short barrel, a detachable box magazine, open sights, and a tactical rail mounted forward of the receiver for an optic. Cooper argued that such a rifle would be the one rifle to have if you could only have one.
The Ruger GSR is one of the best selling Scout rifles on the market today, and certainly one o the most durable. It comes with either a 16 or 18.5 inch barrel length and in either blued or stainless steel. The caliber chamberings are in .308 Winchester, 5.56x45mm NATO, and .450 Bushmaster.