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MikeD

TriStar Bullpup shears bolt lug and injures shooter.

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Salty,  can you see through the lug channel on your carrier?  Wondering if they are made like that or if this one blew.  It looks awful jagged in the pic...  

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Uhh I could be forgetting what a bolt looks like but I see BOTH lugs still there.. I see some chewing near the cam lug, but the cam lug is not a pressure containing area.. But the pictures would be nicer if they rotated the bolt around from the same perspective.

My theory is either trunnion failure, case head failure (ammo), or OOB, which would require the bolt carrier was made wrong or was modified to allow the hammer to strike the firing pin without being closed..

Could still be that the gun is total trash, but bolt lug failure does not seem to be the problem.

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Yeah,  I was wondering about the lugs too because even if one broke there should be one left.  Was also wondering about how it could have an out of battery discharge.  Don’t have a TriStar to look at.  Maybe Salty can look at his.  Hopefully more info will come out on what really happened here.

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Damn, that's bad enough as is, thankfully not more serious.

Watching this to see if more info becomes available.

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shhhhhhhhhheeeeeeeeeeeeeeyyyyyyIIIT!  that is nasty! 

company makes half-assed product, tells folks to run atomic stuff in it, gun grenades.  gee, couldnt see how this was gonna end up

i am glad the guy  is "alright".... my SN was below 400, maybe there wont be alot of these floating around to hurt folks.

i sold mine yesterday,  riveted normal trunnion on,  sent it down the road.   damn now i gotta send him this so he can watch for a recall or whatever....

 

my carrier had voids, they replaced it...  no other parts were addressed....

 

could this have been barrel obstruction or " user error" ?  

 

bolt would rotate enough when you could miss the receiver guide rail with a lug, but i dont know if it would go near battery to get  a round to fire....

 

has anything like this happened before on the russian guns?

 

these things are bad luck, i caught  a ricochet (shooting at a piece of  steel, vertical steel, im a dumbass, i know... had safety glasses on though, ha!) the first night i had mine...

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Hard to blame heat treatment when there are no visible broken parts other than what is normal with a kaboom. None of the pressure parts are broken that I can see in any of the photos.

I screwed around with my saiga and I could almost get the bolt into the carrier in a way that would fire out of battery, I did not want to damage my shotgun so I stopped without forcing the parts together.. So it's "possible" that this is user error.. Also possible that a chain reaction of gun issues and incorrect modification could have also resulted in this issue.. To me this looks mostly like a OOB firing than a critical part failure... The other option is case head separation which is pretty much non existent in shotguns.

One thing that strikes me is that the bolt is not in the carrier when installed into the gun. And the damage to the cam lug seems inconsistent to what would happen if the bolt was correctly installed in the carrier.. Which leans more toward user error. You have to work pretty hard to get it in wrong, but I'm pretty sure it can be done.

With the bolt installed wrong it is possible for the firing pin to be struck without the bolt even close to being locked.

A couple photos of the Trunnion would be really nice, and the back of the bolt carrier. Because that could be the issue.

Edited by csspecs
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I asked them if the gun had been modified and they said it was new in the box gun.  I asked them if they were sure it wasn’t the trunnion and they didn’t know what part I was talking about.  I clarified but haven’t heard back.  

Salty,  does the cover come off easily or do you have to remove the shell to disassembly it?  I saw it has an adjustable gas plug under the shell.  Do you have to remove the shell to adjust it?  Did yours have a hole through the lug channel on the bolt carrier?  

 

I am almost suspecting they were firing it on the low brass setting.  Still doesn’t seem it should have done all that though.  Tons of Saiga’s get hammered on with incorrect settings and Veprs hammer themselves with high brass.  Never seen this out of them...

 

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the shell had to come off to get into the action.... i think its only 6 screws, but screws had to def be removed before top cover came off...

 

hole as in bad casting or as in a on purpose  hole?

i feel like i could almost get my bolt/carrier installed wrong as well on that tristar,  which with "stacking tolerances" or whatnot on clone guy i feel is a recipe for disaster 

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If the bolt was upside down and /or grit held the firing pin in the forward position, it could have either slam fired on chambering, or fired without the lugs engaged?

 

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It looks like the carrier skipped right over the locking cam on the bolt. Are the bolts really wobbly in these? I'm glad I wasn't there. The shooter is SO lucky none of that got the eyes, face, or unit (or did it?). That scarring on the arm looks like it may be worth a few bucks too. I'd like to see the manual and find out whether or not it states any ammunition limitations. 1.25 oz at 1700 fps is pretty hot. I'm not an expert on DE, but would hazard a guess that it is max dram. I was over firing 3" loads a long time ago. Too expensive and too punishing. If what I need to do requires 3" I'll just grab a rifle and fire more shots at whatever it is that needs to be utterly destroyed.

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 Looks like the trunion KB'd. Probably ejection port side split and bolt blew straight back thru because it could.

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