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  • Community Default Avatar
    by - Lifetime Points: 73611
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  • Armando, that extension above the barrel is the "two-stage piston-driven operating system" (instead of a gas impingement system) that provides the user with a cleaner, cooler-running, reliable firearm that is truly state-of-the-art. Most have an adjustable knob at the end. Piston uppers pictured here : google.com/search?biw=1280&bih=618&tbm=isch&sa=1&ei=mud_W760KM36zgLg6rLYBQ&q=ar+piston+vs+gas+upper&oq=ar+piston+vs+gas+upper&gs_l=img.3...100784.105414.0.105781.12.12.0.0.0.0.257.1193.11j0j1.12.0....0...1c.1.64.img..0.7.773...0i8i30k1j0i24k1.0.B45reGoyET8#imgrc=zbS44qIB43U1IM:

  • Community Default Avatar
    by - Lifetime Points: 25707
  • Those are Troy Industries folding BattleSights. Specs here - Ruger SR-556SC semi automatic rifle --- 5.56mm NATO Caliber (will accept .223 Remington caliber) --- 16.12" cold hammer forged, chrome line MIL-SPEC 41V45 barrel --- Target crown --- 1:9" right hand twist --- 6 grooves --- 10 round capacity detachable box magazine --- Fixed position M4 style buttstock --- Hogue Monogrip pistol grip --- Manganese phosphate and hard coat anodize finish --- Black --- >>>>>>>Troy Industries folding BattleSights --- Two stage piston --- Quad rail handguard --- Chrome plated bolt carrier group --- One piece bolt carrier and extractor --- 34.50" overall length --- 7.75" tall --- 13.5" LOP --- 7.94 lbs

  • Community Default Avatar
    by - Lifetime Points: 24
  • HI Armando, Those are Troy Industries folding BattleSights. Specs here - Ruger SR-556SC semi automatic rifle --- 5.56mm NATO Caliber (will accept .223 Remington caliber) --- 16.12" cold hammer forged, chrome line MIL-SPEC 41V45 barrel --- Target crown --- 1:9" right hand twist --- 6 grooves --- 10 round capacity detachable box magazine --- Fixed position M4 style buttstock --- Hogue Monogrip pistol grip --- Manganese phosphate and hard coat anodize finish --- Black --- >>>>>>>Troy Industries folding BattleSights --- Two stage piston --- Quad rail handguard --- Chrome plated bolt carrier group --- One piece bolt carrier and extractor --- 34.50" overall length --- 7.75" tall --- 13.5" LOP --- 7.94 lbs

  • Community Default Avatar
    by - Lifetime Points: 25707
  • Those are Troy Industries folding BattleSights. Specs here - Ruger SR-556SC semi automatic rifle --- 5.56mm NATO Caliber (will accept .223 Remington caliber) --- 16.12" cold hammer forged, chrome line MIL-SPEC 41V45 barrel --- Target crown --- 1:9" right hand twist --- 6 grooves --- 10 round capacity detachable box magazine --- Fixed position M4 style buttstock --- Hogue Monogrip pistol grip --- Manganese phosphate and hard coat anodize finish --- Black --- >>>>>>>Troy Industries folding BattleSights --- Two stage piston --- Quad rail handguard --- Chrome plated bolt carrier group --- One piece bolt carrier and extractor --- 34.50" overall length --- 7.75" tall --- 13.5" LOP --- 7.94 lbs

  • Community Default Avatar
    by - Lifetime Points: 7541
  • Please click the green box stating it as the best answer.
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  • Community Default Avatar
    by - Lifetime Points: 7541
  • HI Armando, Those are Troy Industries folding BattleSights. Specs here - Ruger SR-556SC semi automatic rifle ---
    5.56mm NATO Caliber (will accept .223 Remington caliber) ---
    16.12" cold hammer forged, chrome line MIL-SPEC 41V45 barrel ---
    Target crown ---
    1:9" right hand twist ---
    6 grooves ---
    10 round capacity detachable box magazine ---
    Fixed position M4 style buttstock ---
    Hogue Monogrip pistol grip ---
    Manganese phosphate and hard coat anodize finish ---
    Black ---
    >>>>>>>Troy Industries folding BattleSights ---
    Two stage piston ---
    Quad rail handguard ---
    Chrome plated bolt carrier group ---
    One piece bolt carrier and extractor ---
    34.50" overall length ---
    7.75" tall ---
    13.5" LOP ---
    7.94 lbs

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