Broken Bolt Carrier survey - Page 6 - XDTalk Forums

**gunnut1** · 08-10-2009, 06:29 AM

Quote:

Originally Posted by mpak87

I pulled this smart one a few weeks ago, shooting a bad handload (not mine, and trust me, I have learned my lesson) through my lefty Stag AR.

We think that there was either a double charge or bad powder (potentially both.) The shell stuck in the chamber, and the gas blew back through the bolt carrier, blowing the bottom out. The gas vented out through the magazine. It blew all of the cartriges, follower, spring and base plate out on to the ground, and had enough energy to launch the magazine body after it. The upper receiver is bulged, the bolt carrier split on the bottom and cracked on the top, and the extractor is bent back. I have yet to get the shell out of the chamber, but it ruptured in there.

In this pic, you can see the front end of the carrier. Note the crack along the top edge below the gas key.

Close up of the pic above

Upper receiver, note the bulge below the ejection port.

The bent extractor, and the chunk of the case rim that was ripped out.

View of the star chamber and stuck case

From what I could see, the lower appeared to be intact. When I'm able to afford it, I'm going to build a new upper. If anyone has a better idea of what happened, I would like to hear it. I am also wondering if my barrel would be reusable. If there are any other pictures that would be useful I'll try to take them.

Possibly a squib. I blew up a Springfield XD with a squib. It is impossible to overload a .223 cartridge. And bad powder is doubtful also.
NOw the wrong powder is a possibility also. Did the gun blow up after a malfunction or did it blow up when you pulled the rigger? In other words, ws there a problem with the previous round? Did the previous round eject properly or did you have to eject it by hand?

**gunnut1** · 08-10-2009, 06:31 AM

Colt pre-ban H-bar. Several thousand rounds thru it. Never had a problem with the blot or carrier.

**HPD SRT** · 10-19-2009, 02:08 AM

Model 1 Sales, Owned about 2 years with a kit rifle I put together for 3 gun. Didn't keep a perfect round count but had to be around 3000 maybe? Shouldn't snap in half I know that much.

ETA:
I forgot, this broke during my second to last stage, end of the stage thankfully. Anyway the funny thing is I managed to shoot about 2 or 3 more rounds with it like this, as I thought it was a malfunction and just rolled with it. Obviously I stopped after I inspected and saw half the bolt still in the chamber and the rest of the bcg locked back.

Dan Carey · 11-11-2009, 08:21 PM

Man that looks scary.

KEVWYO · 11-12-2009, 12:07 AM

Quote:

Originally Posted by mpak87

I

We think that there was either a double charge or bad powder (potentially both.) The shell stuck in the chamber, and the gas blew back through the bolt carrier, blowing the bottom out. The gas vented out through the magazine. It blew all of the cartriges, follower, spring and base plate out on to the ground, and had enough energy to launch the magazine body after it. The upper receiver is bulged, the bolt carrier split on the bottom and cracked on the top, and the extractor is bent back. I have yet to get the shell out of the chamber, but it ruptured in there.

Upper receiver, note the bulge below the ejection port.

The bent extractor, and the chunk of the case rim that was ripped out.

View of the star chamber and stuck case

From what I could see, the lower appeared to be intact. When I'm able to afford it, I'm going to build a new upper. If anyone has a better idea of what happened, I would like to hear it. I am also wondering if my barrel would be reusable. If there are any other pictures that would be useful I'll try to take them.

This is pretty wild ... I had my AR go KaBOOM! on me with almost identical damage about 7-8 years ago. I was shooting Federal XM193 ammo.

**HPD SRT** · 11-13-2009, 08:28 PM

Just a little update:

Even though it's still considered crap still, Model 1 Sales DID send me a free replacement brand new bolt. For backup only now of course...

sourpatch45 · 11-16-2009, 03:10 PM

my bolt in my cmmg short barreled rifle has never had any problems, it is the upgraded bolt that cmmg offerers and is in a m16 carrier

i only have about 1000 rounds through it so the long term reliability is unknown at this point

08-10-2009, 06:31 AM	#52
gunnut1 XDTalk 100 Member Join Date: May 2006 Location: FTW area of Texas Posts: 221	Colt pre-ban H-bar. Several thousand rounds thru it. Never had a problem with the blot or carrier.
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10-19-2009, 02:08 AM	#53
HPD SRT XDTalk 1K Member Join Date: Dec 2006 Location: Southeastern WA Posts: 1,443	Model 1 Sales, Owned about 2 years with a kit rifle I put together for 3 gun. Didn't keep a perfect round count but had to be around 3000 maybe? Shouldn't snap in half I know that much. ETA: I forgot, this broke during my second to last stage, end of the stage thankfully. Anyway the funny thing is I managed to shoot about 2 or 3 more rounds with it like this, as I thought it was a malfunction and just rolled with it. Obviously I stopped after I inspected and saw half the bolt still in the chamber and the rest of the bcg locked back. __________________ My Album SA XDm-9 Standard/OD lower SA XD-45 Tactical---Springerized! SA XD-45 Compact FN SLP MK 1 12 GA Model 1 EM-4 CAR - set for 3 gun Winchester Model 70 .308 Remington 870 Express Magnum USPSA: A-57358 PISTOLGEAR SpringerPrecision Last edited by HPD SRT; 10-19-2009 at 02:12 AM.
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11-11-2009, 08:21 PM	#54
Dan Carey XDTalk Member Join Date: Feb 2006 Posts: 50	Man that looks scary. __________________ Serendipity2525@aol.com
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11-13-2009, 08:28 PM	#56
HPD SRT XDTalk 1K Member Join Date: Dec 2006 Location: Southeastern WA Posts: 1,443	Just a little update: Even though it's still considered crap still, Model 1 Sales DID send me a free replacement brand new bolt. For backup only now of course... __________________ My Album SA XDm-9 Standard/OD lower SA XD-45 Tactical---Springerized! SA XD-45 Compact FN SLP MK 1 12 GA Model 1 EM-4 CAR - set for 3 gun Winchester Model 70 .308 Remington 870 Express Magnum USPSA: A-57358 PISTOLGEAR SpringerPrecision
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11-16-2009, 03:10 PM	#57
sourpatch45 XDTalk 4K Member Join Date: Jun 2008 Location: Boise, ID (its boy-see NOT boy-zee!!!) Posts: 4,856	my bolt in my cmmg short barreled rifle has never had any problems, it is the upgraded bolt that cmmg offerers and is in a m16 carrier i only have about 1000 rounds through it so the long term reliability is unknown at this point __________________ I haven't stopped believing in god. I just stopped beliving he cares. There might be a god, there might not, but i dont think it matters. Either way were on our own.-Jace Wayland If you want to polish your barrel click the link below http://www.xdtalk.com/forums/xdtalk-...ng-thread.html
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Bolt broke in my AR, ideas?	This thread	Refback	12-14-2008 11:22 AM