AR15 hammers


PDA






jblackfish
May 15, 2013, 07:03 PM
Can anyone explain to me why some hammers are notched and some are rounded? I have two complete lowers, one I built and one I bought and have one of each hammer. Why the difference and does one work for some uppers and not others, etc. I'd appreciate the explanation. See photos:
http://i646.photobucket.com/albums/uu185/jblackfish/Notched_zps850d4f9a.jpg (http://s646.photobucket.com/user/jblackfish/media/Notched_zps850d4f9a.jpg.html)
http://i646.photobucket.com/albums/uu185/jblackfish/Rounded_zps2317b69d.jpg (http://s646.photobucket.com/user/jblackfish/media/Rounded_zps2317b69d.jpg.html)

If you enjoyed reading about "AR15 hammers" here in TheHighRoad.org archive, you'll LOVE our community. Come join TheHighRoad.org today for the full version!
HOOfan_1
May 15, 2013, 08:02 PM
The notched hammer is meant for semi-auto bolt carriers. I think Colt introduced it as a safety feature to prevent slam fires

edit: here is an explanation

http://www.ar15.com/content/legal/AR15-M16Parts/

better discussion

http://www.ar15.com/forums/t_3_118/400702_The_design_of_the_AR15_hammer___why_the_notch__why_the_tail_.html

jakk280rem
May 15, 2013, 08:06 PM
I believe the notched hammer was introduced by Colt for use with their semi-auto (unshrouded) carriers to prevent an out of battery firing condition.

68wj
May 15, 2013, 08:12 PM
Stops "automatic" fire if the disconnector doesnt hold the hammer back. It snags the firing pin and stops the forward motion of the bolt carrier.

Dr.Rob
May 15, 2013, 08:56 PM
Also notched hammers are bad (less reliable) for 9mm uppers.. or so I have read.

briansmithwins
May 15, 2013, 10:03 PM
The notched hammers get hung up on the firing pin when you have a unshrouded bolt carrier. This damages the firing pin retaining pin as well as the firing pin.

They have no positive value.

BSW

taliv
May 16, 2013, 12:02 AM
They have no positive value.

?

if you have a shrouded carrier, it doesn't matter. if you have an unshrouded, use the notched.

If you enjoyed reading about "AR15 hammers" here in TheHighRoad.org archive, you'll LOVE our community. Come join TheHighRoad.org today for the full version!