These models are similar to the one you are viewing.
.223 Rem. or .222 Rem. (disc.) cal., 5 (standard mag. starting in 1989), 10 (disc.), or 20* shot detachable mag., 18 1/2 in. barrel, gas operated, blue finish, aperture rear sight, military style stock, approx. 6 3/4 lbs. Mfg. 1975-2004.
.204 Ruger or .223 Rem. cal., gas operated, 20 or 24 (.204 Ruger only) in. standard barrel, stainless steel receiver, trigger guard, and bolt, integral machined Picatinny rail on receiver top, Brown or Gray laminate Sporter stock, Brown/Gray laminated thumbhole silhouete stock, with or w/o extended Monte Carlo cheekpiece, 10 shot AR-15 style mag., 11 1/2 lbs. New 2005.
.308 Win. cal., 21 in. barrel, detachable 10 or 20 shot mag., adj. gas system, carry handle, Entreprise Type 03 receiver, parkerized finish, injection molded handguard, zero climb muzzle brake, injection molded standard buttstock with pistol grip, adj. front sight, adj. rear aperture sight, 9 1/2 lbs. New 2009.
7.62x39mm cal., gas operated mechanism with tilting bolt, 20 1/2 in. barrel with folding bayonet, bolt cocking is by separate bolt handle installed on right side of receiver, detachable 10 shot mag., open type sights, hardwood stock with vent. forend, approx. 8,000 mfg. circa mid-1960s.
5.56 NATO cal., GPO, 16 in. barrel, rotary bolt, utilizes original Swiss 550-style 20 or 30 shot translucent mags., black polymer folding skeletonized stock and forearm that surrounds barrel, gray finish, post front sights, adj. rotary diopter drum rear sight, two-stage trigger, top accessory rail, 7 lbs. Mfg. 2012-2014.