Rock River Arms AR 15 Lower Parts Kit AR0120

The Rock River Arms AR 15 lower parts kit AR0120 is their basic, complete AR-15 lower parts kit.  The

includes the basic, black A2 pistol grip and a standard single stage trigger group.

Rock River Arms AR 15 lower parts kit ar0120

Rock River Arms is one of our best selling AR-15 lower parts kits.  They have been around and they have been making AR-15 and AR-15 parts for quite some time.

The AR0120 will fit any brand of current, in spec AR-15 lowers on the market.  At this time, Rock River Arms is using coiled roll pins, to me, those seem to be easier to install than the split type roll pins.  The Rock River Arms AR0120 includes a standard, right hand safety selector.  They do offer an ambidextrous safety selector separately, but not in any of their AR-15 lower parts kit.

With this kit, the only other items you will need to complete your build is a buttstock, an upper and some mags and ammo.

The AR0120 includes

  • Hammer
  • Hammer Spring
  • Hammer Pin
  • Trigger
  • Trigger Spring
  • Trigger Pin
  • Disconnector
  • Disconnector Spring
  • Safety Detent
  • Safety Detent Spring
  • Standard, Right Handed Safety Selector
  • Black, A2 Pistol Grip
  • Hex Drive Grip Screw
  • Star Grip Washer
  • Standard Trigger Guard
  • Trigger Guard Roll Pin
  • Buffer Retainer Pin
  • Buffer Retainer Spring
  • Take Down Pin
  • Take Down Pin Detent
  • Take Down Pin Detent Spring
  • Pivot Pin
  • Pivot Pin Detent
  • Pivot Pin Detent Spring
  • Right Handed Magazine Catch
  • Magazine Catch Button
  • Magazine Catch Spring
  • Bolt Catch
  • Bolt Catch Detent
  • Bolt Catch Detent Spring
  • Bolt Catch Roll Pin

The Rock River Arms AR 15 lower parts kit is generally easy to install, just make sure not to loose the small parts and do not get the diss-connector spring and the bolt catch spring confused.  On the disconnector spring, one end is larger than the other and make sure you put the large end down into your trigger.