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This is a PTR91, it's an American clone of the German H&K G3 or HK91 (which in turn was licensed from the Spanish CETME Modelo B).
This one is outfitted with wooden furniture and a lower receiver with a separate pistolgrip, looking much like Spanish CETME rifles and early service G3 rifles.
Precision Target Rifles have been making G3/HK91 clones for many years now, and they've grown quite good at it, they're available in many configurations and with many options, and the basic models are quite affordable, usually going for a bit below $1000, sometimes below $900, which is a great deal for a full sized 7.62x51mm NATO/.308 Winchester battle rifle.
Seen in this photo is also a huge stack of magazines, exemplar of how cheap and abundant the standard German aluminum 20rd magazines are.