Warning

 

Close

Confirm Action

Are you sure you wish to do this?

Confirm Cancel
Member Login
Site Notices
9/22/2017 12:11:25 AM
Posted: 10/7/2001 5:13:50 PM EDT
Can someone please explain to me what it means when a gun fires from a "closed" or "open" bolt. Why would a gun use one method rather than the other? Are there differences in accuracy/speed/safety/reliability/etc?
Link Posted: 10/7/2001 5:16:56 PM EDT
Link Posted: 10/7/2001 5:21:21 PM EDT
Easy enough--open bolt weapons in semi-auto are no longer made. Open bolt designs are primarily machine gun designs--the bolt is a huge hammer with a fixed firing pin--the round is stripped off the mag, pushed into the chamber and fired all in the same motion. In an open bolt semi, the bolt is caught and held open by the trigger mechanism after the first shot fired. Closed bolt designs use a separate hammer to hit a firing pin in a closed bolt. Benefits to open bolt guns--very simple mechanism, very reliable. Benefits to closed bolt guns--generally more accurate as you don't have to deal with the weight of the bolt moving with each shot. The ATF blocked production of the open bolt guns as they were too easy to convert to full auto. AFARR
Link Posted: 10/7/2001 5:38:24 PM EDT
Link Posted: 10/7/2001 5:43:57 PM EDT
Thanks everyone for the quick responses! Makes sense to me now :)
Link Posted: 10/8/2001 12:50:36 AM EDT
The M-60 machine gun is an example of an open-bolt weapon in which the firing pin is not fixed. The firing pin cams into firing position as the bolt locks. Zac
Top Top