AK failing functions test

[mroels]

I've poster before about having some hammer follow issues. I haven't even taken this rifle out at this point because it isn't passing funcitons check. It isn't all the time though. I've got a G2 trigger and NDS receiver. I am aware of the common issue and have made the suggested mods to the trigger group. But it just doesn't seem to fix it!!

I'm fairly certain its a hammer follow issue and not a slam fire issue. This is because everytime I cycle the bolt hard, the disconnector doesn't let the hammer go unless I release the trigger at which point it catches as normal. However if I pull the trigger and keep it depressed a bit and then manually cycle the bolt the hammer will not catch on the disconnector but follow the bolt.

Now seeing as how I already modded the G2 fcg, i'm wondering I getting a retainer plate instead of using the sheperds hook might work. Will it maybe seat the trigger and disconnector a bit higher? Or should I just give up and buy a different trigger group?

thanks

mroels

[Vepr62]

ak

I don't know what you did but any "mods" to a FCG don't sound safe to me. Take it to a competent smith/builder. Where are you located?
V.

[TonyM]

Take some pics of your hammer. You may not have modded it enough.


Vepr: Mods to the FCG on AKs is very normal, not just for builds, even my "Professionally built" AK needed it.

[MrNiceGuy]

+1 on what TonyM said.

I had to file mine down a few times (only a little at a time) to get it just right.

See my thread.

[motorhead]

pix. check the disc. for burrs. check the disc. spring especially. also the sleeve. probably best not to shoot until this is fixed, could double. retainer will not change fcg position. nds had a prob. with g2 single hooks, you did go double hook, right?

[bridgeport]

When you fire a rifle, the forces of recoil work on the trigger components differently than when you just cycle by hand. When cycling by hand the disconncect should always catch the hammer 100% of the time PERIOD.
if it does not and you do not have the knowlege to fix it; Take it to somebody who does. If you even slightly deformed a hole either by enlarging,
egging, warping, etc. then it needs to be looked at by a competent smith.
When you fire the rifle, the finger sometimes jerks forward ever so slightly and can cause this slight lapse in function of the trigger components, especially in the AK type. It must be understood that not all holes are all the same size, and your disconnect may have a different size hole (requires a bushing) such as on the bulgarian types and this can cause "leaning" and or incorrect fit. There are other issues that can come into play, but these are common. I urge you to have a competent person check for fit and correctness of installation prior to loading and attempting to fire.

[mroels]

pix. check the disc. for burrs. check the disc. spring especially. also the sleeve. probably best not to shoot until this is fixed, could double. retainer will not change fcg position. nds had a prob. with g2 single hooks, you did go double hook, right?

G2 single hook...they aren't interchangeable are they?...wouldn't I have to cut into the receiver to make a double hook work?...pics coming up

[mroels]

When you fire a rifle, the forces of recoil work on the trigger components differently than when you just cycle by hand. When cycling by hand the disconncect should always catch the hammer 100% of the time PERIOD.
if it does not and you do not have the knowlege to fix it; Take it to somebody who does.

I won't fire this thing until i know everything is good with it. And I will take it to a professional at some point but I just want to try to take care of it myself first since it appears to be a common problem. I'm just wondering if another trigger group will solve the problem? Midway has an adjustable drop in trigger goup by power custom..but I just wanna know if its worth the $80 or if it will have the same issues as the G2

[mroels]

sorry i've got a really crappy camera...I'm not sure if I took off enough or too much or the wrong angle...also i'm uploading youtube right now to show the action

[grammaton76]

G2 single hook...they aren't interchangeable are they?...wouldn't I have to cut into the receiver to make a double hook work?...pics coming up

Yes, you do have to cut a slot in order to make a double hook work - but only a little cutting, easily done with a dremel. It's a very well documented issue that single-hook G3 triggers have issues on NDS-3 receivers.

An additional benefit is that if you cut conservatively, you end up with no overtravel!

All the AK's I build for folks are on double hook triggers now. It's safer and results in a better feeling pull.

http://www.nodakspud.com/troubleshooting.htm

There have been reports that the Tapco G2 "single hook" fire control set has had malfunctions when installed in some receivers on the market. These reported malfunctions have included the NDS-3 and NDS-65 "economy" receivers.

The most common problem is "hammer follow".

This is when the hammer is NOT caught by the disconnector, and follows the bolt carrier forward, failing to reset for the next shot.

This does not occur in all builds involving our NDS-3/NDS-65 and the G2 "single hook" set.

But, we advise that caution needs to be observed when combining these two products.

Hammer follow is due to a combination of small dimensional variances on each of the parts in the assembly (called "stacking dimensions").

When you combine them together, the hammer is not pushed down far enough for the disconnector to grab it.

The parts generally involved are;

* bolt carrier
* receiver
* fire control group

[mroels]

Kinda shows what's going on. Couldn't film the bolt cycling with the trigger depressed because i only have two hands...basically if i slowly release the trigger the hammer just slaps forward...if i just let the trigger go it catches. thanks for all the advice..


give it some time to process the video

[TonyM]

I think you can take more off the hammer, making the angle a little more severe.

[TonyM]

I know this looks nasty, never mind the grease and gunk from being dirty, it's an AK....

This should show how much I had to take off to get this single hook Arsenal to work correctly 100% of the time. Build to build the amount varies, so go slow and check often.

[JeffM]

Sometimes you can get away with just trimming the hammer, but you may also need to file the bottom of the forward part of the disconnector so it can travel further forward to catch the hammer shelf.

Oaklander put up pics for this fix a while ago.

ETA:

ARS, while far from CA friendly, does come out with a gem of info from time to time:

http://www.arizonaresponsesystems.com/notes/aktrigger/pageaktrigger.htm

I haven't had to "shorten" the front on any of my builds, but I have had to file down the bottom/front on most.

[vandal]

If you have not gone to G2 double-hook and have not cut the second slot to the specified length (not the same length as the original slot!) you are going to waste a lot of time.

http://www.arizonaresponsesystems.com/notes/aktrigger/pageaktrigger.htm