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Posted: 2/29/2024 11:56:19 AM EDT
Besides the cam pin, any differences between the carrier dimensions?
I got a bcg from a factory gun. It won’t fit any of my 4 uppers built from G stripped uppers. The stripped carrier won’t fully seat. I use a variety of bcgs in them already including a REBCG with no problems. This new carrier has some carbon and the previous owner claimed 500-1k rounds so it was running.  Attached File |
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MT, USA
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Posted: 2/29/2024 1:17:47 PM EDT
[#1]
Doesn't slide in at all or interference at the gas key/gas tube?
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Posted: 2/29/2024 1:25:32 PM EDT
[Last Edit: bkpkr]
[#2]
Whatever is causing the interference is right about when the lugs contact the chamber. It locks up about an inch or so before it would be closed. In 4 G (non tabbed) uppers that an REBCG slides freely in.
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Posted: 2/29/2024 2:08:40 PM EDT
[Last Edit: jkid1911]
[#3]
Originally Posted By bkpkr: Besides the cam pin, any differences between the carrier dimensions? Other than tolerance variations there shouldn’t be. Please clear this up: What factory gun did the BCG come out of? Is the BCG the one on the photo? Is it not a REBCG? Why are you testing a stripped BC rather than an assembled one? |
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Posted: 2/29/2024 2:26:35 PM EDT
[Last Edit: bkpkr]
[#4]
Quote HistoryOriginally Posted By jkid1911: Other than tolerance variations there shouldn’t be. Please clear this up: What factory gun did the BCG come out of? Is the BCG the one on the photo? Is it not a REBCG? Why are you testing a stripped BC rather than an assembled one? Quote HistoryOriginally Posted By jkid1911: Originally Posted By bkpkr: Besides the cam pin, any differences between the carrier dimensions? Other than tolerance variations there shouldn’t be. Please clear this up: What factory gun did the BCG come out of? Is the BCG the one on the photo? Is it not a REBCG? Why are you testing a stripped BC rather than an assembled one? 1) just got it from the EE. From the seller: “it is the enhanced bolt carrier group with the nanoweapon coating. Pulled it from a Super Duty I ended up parting out” 2) yes 3) it is not marked as such nor was it claimed to be 4) to determine what was hanging up. It was hanging up as a complete bcg, so I was fitting the stripped carrier to eliminate variables. The carrier itself hangs up. It’s very likely I’m just retarded but I can’t find any difference on the website about the carrier dimensions across G bcgs. |
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Posted: 2/29/2024 2:31:04 PM EDT
[Last Edit: WUPHF]
[#5]
What does the gas key opening look like?
If it’s hanging up in 4 separate guns, it has to be a carrier issue, and there’s really nothing else that could be hanging up on a stripped carrier. |
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Posted: 2/29/2024 2:33:05 PM EDT
[Last Edit: bkpkr]
[#6]
Quote HistoryOriginally Posted By WUPHF: What does the gas key opening look like? If it’s hanging up in 4 separate guns, it has to be a carrier issue, and there’s really nothing else that could be hanging up on a stripped carrier. I’ll have to check it out after work tonight. Kinda what I’m thinking too. Trying to determine if I got a shit part or it’s my fault. My understanding was the only difference was the directional cam pin, but that is not a factor with my problem. |
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Posted: 2/29/2024 2:38:23 PM EDT
[#7]
Quote HistoryOriginally Posted By bkpkr: It’s very likely I’m just retarded but I can’t find any difference on the website about the carrier dimensions across G bcgs. Haha, that’s usually my go to response as well, but unlikely. I’d have to agree and go with taking a hard look at the bolt carrier gas key. If the assembly is internally out of spec or it’s cocked somehow, the gas tube will go in but then hang up. Unless of course it’s not going in at all. A spare gas tube would eliminate at least one of these…. |
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Posted: 2/29/2024 2:41:01 PM EDT
[#8]
Quote HistoryOriginally Posted By bkpkr: I’ll have to check it out after work tonight. Kinda what I’m thinking too. Trying to determine if I got a shit part or it’s my fault. My understanding was the only difference was the directional cam pin, but that is not a factor with my problem. There are actually other differences in the Geissele carrier specs, but not to the extent that would prevent it from moving freely inside the upper if it’s not out of spec. |
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Posted: 2/29/2024 2:41:51 PM EDT
[#9]
I've got a basic Toolcraft BCG in a G upper.... it gotta be an issue with your bcg
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Posted: 2/29/2024 2:52:09 PM EDT
[Last Edit: bkpkr]
[#10]
Yeah I know all of the uppers are gtg. Just making sure I didn’t buy a part expecting it do something it wasn’t designed to do. I just got it last night and didn’t have time to mess with it too much. Will check out the gas key tonight.
TLDR: should any G bcg work in any G receiver? |
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Posted: 2/29/2024 5:43:48 PM EDT
[#11]
A REBCG pulled from a super duty rifle/upper will not work in a standard upper. The cam pin is different. @gacs
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Posted: 2/29/2024 5:44:27 PM EDT
[#12]
Yeah I’m aware of the cam pin. Covered already. Besides that.
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Posted: 2/29/2024 5:49:59 PM EDT
[#13]
Remove cam pin and bolt. Gently slide carrier in to receiver and see if it hangs up.
Take bolt by itself and insert it by hand to see if it passes freely into the barrel extension. This should help identify the culprit. |
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Posted: 2/29/2024 6:56:50 PM EDT
[#14]
Hey, we would be interested in checking this out! Can you please contact customer service on our website and send us an email so we help
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Posted: 2/29/2024 8:50:54 PM EDT
[Last Edit: bkpkr]
[#15]
Got a better look. Gas key is definitely borked.
 @GACS still want me to email or should I contact the seller? To be clear this was a used part I purchased off the EE so I have zero expectations from you guys. ETA: Seller has a link to the thread, not trying to turn this into any kind of shit storm or feedback issue, it isn’t. Seems like a freak thing. It was well packaged. |
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Posted: 2/29/2024 8:51:55 PM EDT
[#16]
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MT, USA
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Posted: 3/1/2024 12:57:45 AM EDT
[#17]
I sold a used AO Precision BCG in the EE a couple years ago that worked fine in my gun. Didn't work in the gun of the guy that bought it. He figured gas key. I looked at my EE ad pics and sure enough the top of the gas key was dented just like yours. I remember dropping something off my workbench but didn't realize it was the BCG. I offered to fully refund him and pay return shipping or buy him a gas key, but he ended up saying he would take of it.
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Posted: 3/4/2024 2:24:29 PM EDT
[#18]
We used to see that quite a bit in the military from troops dropping their carriers. Our fix for them 90% of the time was a fat center punch in the key opening and a rap on the punch with a small hammer. It'll round them back out.
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Posted: 3/4/2024 4:52:14 PM EDT
[#19]
Thread is done. Thanks everyone.
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MT, USA
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Posted: 3/4/2024 5:12:18 PM EDT
[#20]
Quote HistoryOriginally Posted By bkpkr: Thread is done. Thanks everyone. |
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Posted: 3/5/2024 6:43:28 PM EDT
[#21]
Quote HistoryOriginally Posted By bkpkr: Yeah I’m aware of the cam pin. Covered already. Besides that. Ah, my bad. |
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Attached File