In order to participate in the GunBroker Member forums, you must be logged in with your GunBroker.com account. Click the sign-in button at the top right of the forums page to get connected.

AR-18/180 Upper question

gap1916gap1916 Member Posts: 4,977
edited November 2010 in Ask the Experts
I have recently purchased an AR180 upper unit. The rear of the unit has a set of dog ear on both side of the unit with a small hole through each dog ears. The dog ear drops below the upper unit. I have an original operating manual. These dog ears do not appear on the upper unit in the manual and they are not on my other AR-180. What are they for?
Thank you.
Greg
· Share on FacebookShare on Twitter

Comments

  • mark christianmark christian Member Posts: 24,443 ✭✭✭✭
    edited November -1
    Does it look like this?
    AR-18a-1.jpg

    If that is the case then the upper was originally from an AR-18 selective fire rifle.
    · Share on FacebookShare on Twitter
  • gap1916gap1916 Member Posts: 4,977
    edited November -1
    Mark:
    It does not have the pin and anchor type devise the pin is holding but yes it looks like that. What is it for?
    Greg
    · Share on FacebookShare on Twitter
  • mark christianmark christian Member Posts: 24,443 ✭✭✭✭
    edited November -1
    Those are the full automatic componets used in the upper receiver.
    · Share on FacebookShare on Twitter
  • gap1916gap1916 Member Posts: 4,977
    edited November -1
    Are there full auto components in the AR18 lower units as well? I paid $500.00 for the upper is this a good deal?
    Thank you
    Greg
    · Share on FacebookShare on Twitter
  • mark christianmark christian Member Posts: 24,443 ✭✭✭✭
    edited November -1
    quote:Originally posted by gap1916
    Are there full auto components in the AR18 lower units as well? I paid $500.00 for the upper is this a good deal?
    Thank you
    Greg


    Yes, the lower contains a number of internal parts which are specific to allow selective fire and are entirely different from those found in the AR-180. The AR-180 lower is "supposed" to be blocked to prevent the installation of an AR-18 upper, but this seems to vary depending on specific rifles.
    · Share on FacebookShare on Twitter
  • gap1916gap1916 Member Posts: 4,977
    edited November -1
    This upper fits on my AR180 but not my AR180B. It is the 10.5 inch upper and I was thinking about filling out the Federal paper work to make it into a SBR. Any thoughts?
    · Share on FacebookShare on Twitter
  • mark christianmark christian Member Posts: 24,443 ✭✭✭✭
    edited November -1
    The short barreled upper would have been from a Sterling AR-18 Police Rifle, although there were also a few hundred semi auto AR-180s build with the short barrel. Some variations of the "Shorty" upper have a second pistol grip under the shortened forend, but those are not common. If you chose to do so you can file a Form 1 and pay the $200 making tax and have a Short Barreled Rifle.
    · Share on FacebookShare on Twitter
  • gap1916gap1916 Member Posts: 4,977
    edited November -1
    Thank you for the information. Merry Christmas and a very Happy New Year.
    Greg
    · Share on FacebookShare on Twitter
Sign In or Register to comment.