AR Sponsor
Posted: 11/4/2006 2:59:52 PM EDT
|
Does anyone know of a really good demo (animation or blow up) of what the various trigger parts are doing under operation? I've never put together a lower, and I don't really know all of the "parts" that I should; i.e. sear, disconnect etc. and how they interact during the course of operation. Just physically manipulating the hammer, I thought I saw where the trigger would engage the hammer and reset it, but upon closer inspection I don't think I'm correct. |
|
All i could find was m4 operation off bigger hammer's website linky |
|
http://home.fuse.net/bad_mojo/ar15/ARtrigger.jpg I noticed mine has a part that seems to be missing in this awesome drawing, I kludged it in (in red). Also, for the sake of clarity, I added some numerical pointers. Now, can anone tell me which part is the "sear"? |
|
Here is some info for assembling your AR lower: www.ar15.com/content/guides/assembly/lower/ 
|
|
In the true sense of the term, there is no sear. This is a simple single lever trigger and hammer design. The closest thing to a sear is the notch under the "A" in the drawing and it's mating surface at the front of the trigger. When the hammer is back, that notch catches on the end of the trigger. When the trigger is pulled, the end of the trigger slides out of the notch and allows the hammer to swing up/forward to strike the firing pin. The red part you're asking about is the disconnecter, that hook on it catches the hammer as the action cycles and holds the hammer back while the trigger is still pulled. When you relax your trigger finger, the end of the trigger swings up, the disconnecter releases the hammer and the sear notch/trigger again prevent the hammer from moving until the trigger is pulled again. If you are looking to stone the sear, its that notch and mating surface on the trigger that need just a touch of smoothing. Be very careful, it's way easy to go to far and create an unsafe or illegal trigger. |
Ha, please believe me when I say I'm not looking to do anything of the sort - as I said, I've never put a lower together (nor apart) and would have no idea how to "stone the sear" (or what that would accomplish to be perfectly honest). I'm just trying to better educate myself as to how these parts work togther. So the disconnector doesn't really catch the hammer per se - this is what I expected - when I was looking down into the lower just watching what happened I was trying to see which part 'engaged' the trigger to a cocked position after the shot, at first I thought it was the hook on the end of the disconnect, but looking closer I could see that was not the case. I still don't really follow what you're saying about where exactly the sear notch is. EDIT - I think I see it now, I covered it in the disconnect on my drawing, but I looked back at the original and now I think I see what you're talking about - this? http://home.fuse.net/bad_mojo/ar15/ARsear.jpg |
Thanks to both of you - but watching that was even MORE confusing. In that movie, it looks like the 'horn' end of the hammer has a hook on it that is catching something - I didn't understand that at all. |
The video of the M4 is confusing because it has some additional/slightly different parts than the AR-15. The M4 hammer has a hook on the end that is used to catch the auto-sear for full auto operation. Wish I could find an AR animation. |
AR Sponsor