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bulgy 74 failure to feed
5/22/2010 10:17:15 PM
this happens about every 30 rounds
i wish i could post this picture.... but it appears that the ammo is striped form the top of the magazine by the bolt then the round squirts underneath the bolt and jams with the bullet inside the chamber and the case sandwiched between the bolt and trunnion.
suggestions and or help with getting a picture up would be greatly helpful
thanks!
i wish i could post this picture.... but it appears that the ammo is striped form the top of the magazine by the bolt then the round squirts underneath the bolt and jams with the bullet inside the chamber and the case sandwiched between the bolt and trunnion.
suggestions and or help with getting a picture up would be greatly helpful
thanks!
5/27/2010 1:25:42 PM
So you're having a double feed. If both rounds are live, then its a bad mag having worn lips that's why another round was pushed out accidently by the spring pressure in the mag. If the one in the chamber has been fired and just stuck in there, then it's your extractor not doing it's job. A bad extractor is rare for an AK though. Do you keep the chamber spotless?
5/28/2010 1:03:39 AM
the extractor works fine however when i let the bolt fly home it strips the top round but then (some how) manages to jam its self under the bolt face and the trunnion. the tip of the bullet is just inside the chamber at this point.
its the same with all my mags.
its the same with all my mags.
5/28/2010 7:40:52 AM
Originally Posted By fighting-tupperwear:
however when i let the bolt fly home it strips the top round but then (some how) manages to jam its self under the bolt face and the trunnion. the tip of the bullet is just inside the chamber at this point.
however when i let the bolt fly home it strips the top round but then (some how) manages to jam its self under the bolt face and the trunnion. the tip of the bullet is just inside the chamber at this point.
Does this happen when chambering the first cartridge, when firing the rifle, or both?
5/28/2010 11:55:12 AM
[/quote]
Does this happen when chambering the first cartridge, when firing the rifle, or both?
[/quote]
It has jammed wracking them through the weapon and while shooting.
my AR has never jammed..... Russian rifles man....
Does this happen when chambering the first cartridge, when firing the rifle, or both?
[/quote]
It has jammed wracking them through the weapon and while shooting.
my AR has never jammed..... Russian rifles man....
6/6/2010 10:50:49 AM
So I have diagnosed why my 74 is jamming the way it dose but now the question is how do I fix it?
The diagnoses: the reason I believe its jamming is that the bolt / bolt carrier has enough slop that the bolt can actually (if pushed upwards) miss the top round altogether. Or worse partially strip the top round resulting in a train wreck.
Magazines: The magazine is all the way up in the well (the top feed lips actually touch the rails)
Bolt: if I add material to the bolt (the bottom part of the bolt that actually strips the rounds) to account for the slop then there will be interference between the bolt and trunion feed ramps. Not to mention if I can get it back in with the trigger installed…
Slop: pride of the AK line. So my options are down to reducing slop and play between the bolt carrier and receiver. Option 1: Somehow bend the lips on the receiver downward so that the carrier rides lower resulting in less slop. Option 2: add material to the carrier so it rides lower…. (aka weld it up and cut it again)
I’m leaning towards option 1…. option 2 would worried me because of the heat that would be put in to the carrier.
Help/ suggestions?
I'm going to talk to a real AK mechanic hopefully tomorrow so we will see for sure.
The diagnoses: the reason I believe its jamming is that the bolt / bolt carrier has enough slop that the bolt can actually (if pushed upwards) miss the top round altogether. Or worse partially strip the top round resulting in a train wreck.
Magazines: The magazine is all the way up in the well (the top feed lips actually touch the rails)
Bolt: if I add material to the bolt (the bottom part of the bolt that actually strips the rounds) to account for the slop then there will be interference between the bolt and trunion feed ramps. Not to mention if I can get it back in with the trigger installed…
Slop: pride of the AK line. So my options are down to reducing slop and play between the bolt carrier and receiver. Option 1: Somehow bend the lips on the receiver downward so that the carrier rides lower resulting in less slop. Option 2: add material to the carrier so it rides lower…. (aka weld it up and cut it again)
I’m leaning towards option 1…. option 2 would worried me because of the heat that would be put in to the carrier.
Help/ suggestions?
I'm going to talk to a real AK mechanic hopefully tomorrow so we will see for sure.
6/6/2010 4:31:28 PM
Who built it ? What type of receiver ? etc .. Something has to be real far off in specs if the mag is all the way up touiching the rails and the bolt/carrier skip over the round.
6/8/2010 11:11:46 AM
Originally Posted By fighting-tupperwear:
So I have diagnosed why my 74 is jamming the way it dose but now the question is how do I fix it?
The diagnoses: the reason I believe its jamming is that the bolt / bolt carrier has enough slop that the bolt can actually (if pushed upwards) miss the top round altogether. Or worse partially strip the top round resulting in a train wreck.
Some clearance between these parts is normal. generous clearances is one of the reasons the rifle is extremely reliable. I can't determine whether your's has too much without a measurement.
Magazines: The magazine is all the way up in the well (the top feed lips actually touch the rails)
Bolt: if I add material to the bolt (the bottom part of the bolt that actually strips the rounds) to account for the slop then there will be interference between the bolt and trunion feed ramps. Not to mention if I can get it back in with the trigger installed…
Slop: pride of the AK line. So my options are down to reducing slop and play between the bolt carrier and receiver. Option 1: Somehow bend the lips on the receiver downward so that the carrier rides lower resulting in less slop. Option 2: add material to the carrier so it rides lower…. (aka weld it up and cut it again)
I’m leaning towards option 1…. option 2 would worried me because of the heat that would be put in to the carrier.
Help/ suggestions?
I'm going to talk to a real AK mechanic hopefully tomorrow so we will see for sure.
So I have diagnosed why my 74 is jamming the way it dose but now the question is how do I fix it?
The diagnoses: the reason I believe its jamming is that the bolt / bolt carrier has enough slop that the bolt can actually (if pushed upwards) miss the top round altogether. Or worse partially strip the top round resulting in a train wreck.
Some clearance between these parts is normal. generous clearances is one of the reasons the rifle is extremely reliable. I can't determine whether your's has too much without a measurement.
Magazines: The magazine is all the way up in the well (the top feed lips actually touch the rails)
Bolt: if I add material to the bolt (the bottom part of the bolt that actually strips the rounds) to account for the slop then there will be interference between the bolt and trunion feed ramps. Not to mention if I can get it back in with the trigger installed…
Slop: pride of the AK line. So my options are down to reducing slop and play between the bolt carrier and receiver. Option 1: Somehow bend the lips on the receiver downward so that the carrier rides lower resulting in less slop. Option 2: add material to the carrier so it rides lower…. (aka weld it up and cut it again)
I’m leaning towards option 1…. option 2 would worried me because of the heat that would be put in to the carrier.
Help/ suggestions?
I'm going to talk to a real AK mechanic hopefully tomorrow so we will see for sure.
Who made the receiver? The bolt is controled by the lower rails. Without measurements, it's impossible to be certain, but one possibility is that the lower rails are too high or are bent upwards.
6/9/2010 10:57:45 PM
Originally Posted By 1MRBEAN:
Who built it ? What type of receiver ? etc .. Something has to be real far off in specs if the mag is all the way up touiching the rails and the bolt/carrier skip over the round.
Who built it ? What type of receiver ? etc .. Something has to be real far off in specs if the mag is all the way up touiching the rails and the bolt/carrier skip over the round.
no doubt it is out of spec because it started as a tap co flat. i did not have any specs to go to so i used the good ol best guess method....
yes my pass time is setting on the front porch with my banjo......
6/10/2010 11:24:25 AM
Originally Posted By fighting-tupperwear:
no doubt it is out of spec because it started as a tap co flat. i did not have any specs to go to so i used the good ol best guess method....
Originally Posted By 1MRBEAN:
Who built it ? What type of receiver ? etc .. Something has to be real far off in specs if the mag is all the way up touiching the rails and the bolt/carrier skip over the round.
Who built it ? What type of receiver ? etc .. Something has to be real far off in specs if the mag is all the way up touiching the rails and the bolt/carrier skip over the round.
no doubt it is out of spec because it started as a tap co flat. i did not have any specs to go to so i used the good ol best guess method....
You shouldn't blame "Russian rifles" when the receiver is out of spec. It would be impossible to design a rifle that would work properly with whatever receiver someone cobbled together in his garage.
IF the flat was bent correctly (Did you check to see if it is square? Are the sides the same height, etc, etc, etc?), the lower rails are probably improperly placed.
The front of the rails should be level with the rear of the cut in the trunnion. A piece of 1/4" keystock can be used to determine whether the height in relation to the cut in the trunnionis correct and to space the lower and upper rails.
9/13/2010 11:29:38 PM
Wow.... just wow...
It just MIGHT have something to do with your improper build.
You need to hack this thing apart and re-build it PROPERLY.
It just MIGHT have something to do with your improper build.
You need to hack this thing apart and re-build it PROPERLY.
