I bought an AGM mp001 about a year ago and it worked for a while until the trigger sear wouldn't catch the bolt and when I let go of the handle, the bolt would slam back into the uncocked state. I took the thing apart and saw that the trigger sear was pretty worn, so I bought a replacement that cost me $30 bucks with shipping and everything! Well you could probably see that I was pretty mad when I put the new sear in and it didn't fix the problem. So my questions are, What part of the gun does the trigger sear catch, and If I replace this, do you think it'll fix the problem? If not, what do you think is causing the problem?
I know the gun isn't worth very much, but i liked the way it felt and already invested $30 bucks, so I might as well finish the job. Thanks
It almost sounds like a problem with the spring guide stopper (the piece behind both sears that sticks up about 3/4 of an inch) I've seen that cause some problems in the VSR's I've worked on.
Was the sear you replaced the 1st sear or the 2nd sear? The first sear is the one that is contact with the trigger itself; the 2nd sear is the one that locks the piston back when the gun is cocked. The 2nd sear is typically the one that gets worn down, especially if you have an upgraded spring.
Let me know and hopefully I can be of more help.
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If it was the spring guide stopper wouldnt the bolt just slide out of the reciever? I think it has to be the second sear not catching the piston head.
Nope. When I first got my BAR-10 the spring guide stopper fell out (of course I had no idea what it was at the time.) I tried to shoot the gun.. and the bolt would just slam forward. Check to see if there is a little metal piece sticking out the back of the spring guide. If its not there, then that's your problem.
If the spring guide stopper was not in the assembly would mean that there is nothing holding the spring guide in place so when cocking the bold the spring guide would move back with it and the spring wouldnt compress and the bolt will come out of the reciever. If the bolt is slaming forward it is most likely the second sear because the bolt will slam forward if it cant catch the piston head.
If it was the spring guide stopper wouldnt the bolt just slide out of the reciever?
Nah, there is still a tiny piece of metal parallel to the stopper that holds everything together for the specific purpose of something like that happening. However the tension of the spring will still cause it to slam forward. I agree with you about the 2nd sear, however. The only other possibility is that the 1st sear can't take the tension and isn't strong enough to support the 2nd sear.
__________________ BlackHounds- MORS EX TENEBRIS
Team Douche- Tactical Insertion
"I look out for me and mine. That don't include you 'less I conjure it does... So here's us, on the raggedy edge."
Nah, there is still a tiny piece of metal parallel to the stopper that holds everything together for the specific purpose of something like that happening. However the tension of the spring will still cause it to slam forward. I agree with you about the 2nd sear, however. The only other possibility is that the 1st sear can't take the tension and isn't strong enough to support the 2nd sear.
True, I use a PDI V trigger which lacks this part and I forgot about it. Doomsday, how does the piston sear look?
Last edited by lilseuff302 : 12-06-2009 at 12:14 PM.
I replaced the second sear, and it the bolt will lock when you pull it all the way back, but when you try to push it back into the receiver it slams forward.
P.S. On my gun, without the spring guide stopper, you can pull the bolt out of the reciever, there is a little piece to stop it but you can just twist the bolt a little bit and it slides out.
I replaced the second sear, and it the bolt will lock when you pull it all the way back, but when you try to push it back into the receiver it slams forward.
P.S. On my gun, without the spring guide stopper, you can pull the bolt out of the reciever, there is a little piece to stop it but you can just twist the bolt a little bit and it slides out.
Ahh, the joys of clone guns ( don't worry, I speak from having one. mine is a JG G-spec) I would recommend taking the trigger mech apart looking at the 1st sear. see if there is any evident stressing on the piece or metal dust in the trigger box. If there is, that 1st sear might be your problem.
__________________ BlackHounds- MORS EX TENEBRIS
Team Douche- Tactical Insertion
"I look out for me and mine. That don't include you 'less I conjure it does... So here's us, on the raggedy edge."
That little piece actually fits into a hole in the back of the spring guide, if I remember correctly. Im 90% sure. If not it sticks out of the back of a piece in the cylinder. It has to be the spring guide. I had this exact problem when I first got my BAR-10. I opened up the box and out fell this exact piece.
[quote=Heelflip98;188043]That little piece actually fits into a hole in the back of the spring guide, if I remember correctly. Im 90% sure. If not it sticks out of the back of a piece in the cylinder. It has to be the spring guide. I had this exact problem when I first got my BAR-10. I opened up the box and out fell this exact piece.[
The spring guide stopper stays in place, maybe a little wobbly, there is a VERY tiny maybe 1/2mm piece of metal poking out of the back of the spring guide, and it connects to the stopper, I just don't see how this could be the problem of the whole bolt slamming back in, it seems to me that if it were not the piston sear, it would have to be the part of the piston that the sear catches and I'm having trouble understanding which part of the piston that is.
It could also be in backwards. Funny story. I put mine in backwards the first time. Didn't work. Did the same thing (Bolt slam). Take some pliers and take the metal thingy out. Flip it around and press it in (So the opposite end is sticking out). See if that fixes your problem. If not, I would go ahead and put it in the way it was before you messed with it.
Well, I checked with the stopper, that wasn't the problem, I think it's the first sear. The only other question I have is that I bought a " PDI VSR-10 second sear", I do not know what PDI means, is it possible that this piece is not compatable with the rest of the trigger mech? If so, what parts should I replace?
I think you might be blaming the wrong part of the gun for the problem. Open up your cylinder assembly and inspect the rear end of the plastic piston (the lip that catches the sear) for a "flat spot". This is a fairly common problem when dealing with plastic pistons combined with overpowered stock springs. You can temporarily fix the problem by rotating the piston to show an unworn portion of the lip, or you can buy a new aftermarket piston ie: The laylax red piston. Hope this helps =)
Forgive me if someone already suggested this problem but I didnt notice anything in my brief skim of the page.
My piston looks pretty worn, I think that's what I'm going to replace..If I buy the laylax red piston or any other aftermarket piston, will it be compatable with all of other stock parts in the piston?
Alright, I had this gun AWHILE back maybe 2 years ago. Anyhow check your cylinder when mine had the same problem (where the bolt is screwed in by the tiny hex screws) Check right there and make sure the cylinder it self isn't broken. Mine was actually broken causing the slam fire. I still have the cylinder I can put pics up of what I'm talking about in a bit if need be but if thats the case I have a Marui cylinder I can sell you.
Yes, the red piston will fit directly into the stock setup. Before you buy the piston, make sure you verify that my guess is correct by opening the cylinder assembly and rotating the piston to a different side. The gun should fire fine after that.
AGM mp001/ vsr-10 firing problem
