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Posted: 11/9/2013 2:12:04 AM EDT
[#1]
I have two, one was missing some of the coating on the front face of the bcg. Ive only fired a few rounds to function test as its not in my main rifle and it was fine. Its staked properly and i'm not to concerned with a little coating missing for such a good deal. The other is in a bag in my spares and looks brand new. I was thinking of grabbing a nib version they came out with. Everything else ive got from AIM has been gtg, so I have confidence in their bcgs.
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Posted: 11/9/2013 2:42:50 AM EDT
[#2]
That's enough for me to not worry about them being substandard quality.
Quoted: I will back them up if there is ever a problem. http://www.ar15.com/forums/t_2_217/238360_Who_makes_the_AR15_M16__223_5_56_Bolt_Carrier_Group.html&page=1 |
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Posted: 11/9/2013 2:47:59 AM EDT
[#3]
They don't use Carpenter 158.
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Posted: 11/9/2013 3:07:57 AM EDT
[#4]
Quote HistoryQuoted:
They don't use Carpenter 158. That kills it for Me. |
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Posted: 11/9/2013 3:38:29 AM EDT
[#5]
Quote HistoryQuoted:
They don't use Carpenter 158. I have no issue using 9130 over C158. I won't use 8620. |
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Posted: 11/9/2013 4:21:10 AM EDT
[#6]
Quote HistoryQuoted:
I have no issue using 9130 over C158. I won't use 8620. Quote HistoryQuoted:
Quoted:
They don't use Carpenter 158. I have no issue using 9130 over C158. I won't use 8620. x2 |
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Posted: 11/9/2013 4:36:08 AM EDT
[#7]
Quote HistoryQuoted: They don't use Carpenter 158. has there been any objective data saying 9130 is worse??? |
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Posted: 11/9/2013 8:12:25 AM EDT
[#8]
Can some one explain what all the different numbers are and which are the better product? Also is carpenter a brand? Thanks!
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Posted: 11/9/2013 8:16:10 AM EDT
[#9]
Quote HistoryQuoted: Can some one explain what all the different numbers are and which are the better product? Also is carpenter a brand? Thanks! 9130- is basically the same typemof steel-some say better-no brand name. Pissing contest happen all the time as to if its better or not. 8620 is shit for a bolt, hence all the blown up ARs bolts purchased in the panic this year, Its easier to machine-probably why so much of then ended up on the market this year. |
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Posted: 11/9/2013 10:30:32 AM EDT
[#10]
Quote HistoryQuoted:
Carpenter 158 is a brand name for steel, its expensive and only sold in large lots, hence why only big companies can buy it 9130- is basically the same typemof steel-some say better-no brand name. Pissing contest happen all the time as to if its better or not. 8620 is shit for a bolt, hence all the blown up ARs bolts purchased in the panic this year, Its easier to machine-probably why so much of then ended up on the market this year. Quote HistoryQuoted:
Quoted:
Can some one explain what all the different numbers are and which are the better product? Also is carpenter a brand? Thanks! 9130- is basically the same typemof steel-some say better-no brand name. Pissing contest happen all the time as to if its better or not. 8620 is shit for a bolt, hence all the blown up ARs bolts purchased in the panic this year, Its easier to machine-probably why so much of then ended up on the market this year. Yep, correct me if I am wrong but the 9130 bolts are dependent upon their tempering in order for it to be stronger/longer lasting than C-158.... |
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Posted: 11/9/2013 10:32:24 AM EDT
[#11]
Quote HistoryQuoted: Yep, correct me if I am wrong but the 9130 bolts are dependent upon their tempering in order for it to be stronger/longer lasting than C-158.... |
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Posted: 11/9/2013 12:14:36 PM EDT
[#12]
I have two. one unused, one has 50 rounds through the upper its in.
The gas key on the 50 rd one is loose. I have to call aim Monday and see what the solution is. Aim has a good rep so I'm not worried but its irritating as I planned on shooting the new SBR upper today. 
top two are AIM bolts, unsure of maker on other but was shocked when gas key on center bolt came loose till I got out a magnifying glass and saw no bite on screws even though it looked properly staked till I started firing. |
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Posted: 11/9/2013 12:31:29 PM EDT
[#13]
Why didn't you tighten it down yourself?
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Posted: 11/9/2013 12:35:29 PM EDT
[#14]
Quote HistoryQuoted:
Why didn't you tighten it down yourself? Yep. Tighten and stake. Problem solved. |
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Posted: 11/9/2013 12:39:20 PM EDT
[#15]
That's what I'm trying to decide now. I'm thinking about pulling it and checking the holes to make sure there's no damage and torqueing it down.
Edit: Just torqued it down, now I need to find the pic of proper staking and get off my rear and go to the vice. |
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Posted: 11/9/2013 3:24:31 PM EDT
[#16]
Quote HistoryQuoted:
Can some one explain what all the different numbers are and which are the better product? Also is carpenter a brand? Thanks! C158 is milspec for the bolt, and expensive. 8620 is milspec for the bolt carrier and cheap. When buying store brand BCG they may differ from the milspec significantly. For example my AIM 9310 BCG has a 9310 bolt instead of C158 and the extractor & gas key are injection molded parts. Not sure how a injection molded extractor is gonna work/last. time will tell i guess. |
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Posted: 11/9/2013 10:58:09 PM EDT
[#17]
Quote HistoryQuoted:
Carpenter 158 is a brand name for steel, its expensive and only sold in large lots, hence why only big companies can buy it 9130- is basically the same typemof steel-some say better-no brand name. Pissing contest happen all the time as to if its better or not. 8620 is shit for a bolt, hence all the blown up ARs bolts purchased in the panic this year, Its easier to machine-probably why so much of then ended up on the market this year. Quote HistoryQuoted:
Quoted:
Can some one explain what all the different numbers are and which are the better product? Also is carpenter a brand? Thanks! 9130- is basically the same typemof steel-some say better-no brand name. Pissing contest happen all the time as to if its better or not. 8620 is shit for a bolt, hence all the blown up ARs bolts purchased in the panic this year, Its easier to machine-probably why so much of then ended up on the market this year. So the AIM carrier is 8620 so does that mean it is shit? Why don't they just make it out of the good carpenter 158 steel? |
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Posted: 11/9/2013 11:24:32 PM EDT
[#18]
Quote HistoryQuoted:
That kills it for Me. Quote HistoryQuoted:
Quoted:
They don't use Carpenter 158. That kills it for Me. Logo kills it for me. 
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Posted: 11/9/2013 11:32:12 PM EDT
[#19]
Quote HistoryQuoted:
Logo kills it for me. Quote HistoryQuoted:
Quoted:
Quoted:
They don't use Carpenter 158. That kills it for Me. Logo kills it for me. They're talking about Aim, not Spike's. ...But either way. 
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Posted: 11/10/2013 1:59:15 AM EDT
[#20]
.....
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Posted: 11/10/2013 4:18:20 AM EDT
[#21]
Quote HistoryQuoted:
So the AIM carrier is 8620 so does that mean it is shit? Why don't they just make it out of the good carpenter 158 steel? Quote HistoryQuoted:
Quoted:
Quoted:
Can some one explain what all the different numbers are and which are the better product? Also is carpenter a brand? Thanks! 9130- is basically the same typemof steel-some say better-no brand name. Pissing contest happen all the time as to if its better or not. 8620 is shit for a bolt, hence all the blown up ARs bolts purchased in the panic this year, Its easier to machine-probably why so much of then ended up on the market this year. So the AIM carrier is 8620 so does that mean it is shit? Why don't they just make it out of the good carpenter 158 steel? One word, money. It's always been about the greenbacks..... Carpenter is a great metal, just expensive. 8620 is a cheaper option...... |
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Posted: 11/10/2013 4:29:35 AM EDT
[#22]
8620 is the common material for the carrier. The bolt is what is important, and should be either c158 or 9310
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Posted: 11/10/2013 5:09:19 AM EDT
[#23]
Colt carriers are 8620. So are Noveske, Daniel Defense, PSA, Spikes, BCM, Windham, Stag, etc.
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Posted: 11/10/2013 5:57:52 AM EDT
[#24]
The mil-spec calls for 8620 carriers.
There is some dispute about the suitability of 9310 for the bolt. Some say it is actually better than C158 as long as it is properly heat treated. There are numerous threads about this. Who knows what the truth is. Nobody who uses 9310 bolts seems to be complaining. Carpenter makes both steels. Those looks like great BCGs. One BCG I got from AIM (the one they sell without the nickel coating) had a MIM or cast gas key and extractor, but these are both machined billet on this NiB BCG. Being a high speed sponge bob watching printer repairman type, I had to put that bolt with the cast parts in one of my hobby guns. 
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Posted: 11/10/2013 6:16:02 AM EDT
[#25]
Quote HistoryQuoted: So the AIM carrier is 8620 so does that mean it is shit? Why don't they just make it out of the good carpenter 158 steel? Quote HistoryQuoted: 8620 is shit for a bolt, So the AIM carrier is 8620 so does that mean it is shit? Why don't they just make it out of the good carpenter 158 steel? |
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Posted: 11/10/2013 6:31:03 AM EDT
[#26]
BCM states : Milspec Carpenter No. 158® steel
PSA premium: also states: Milspec Carpenter No. 158® steel bolt ?? |
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Posted: 11/10/2013 6:45:05 AM EDT
[#27]
Quote HistoryQuoted:
BCM states : Milspec Carpenter No. 158® steel PSA premium: also states: Milspec Carpenter No. 158® steel bolt ?? Yes. Carpenter 158 is mil-spec; 9310 is not. 8620 is mil-spec for the carrier. The End. |
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Posted: 11/10/2013 7:11:46 AM EDT
[#28]
Quote HistoryQuoted:
Yes. Carpenter 158 is mil-spec; 9310 is not. 8620 is mil-spec for the carrier. The End. Quote HistoryQuoted:
Quoted:
BCM states : Milspec Carpenter No. 158® steel PSA premium: also states: Milspec Carpenter No. 158® steel bolt ?? Yes. Carpenter 158 is mil-spec; 9310 is not. 8620 is mil-spec for the carrier. The End. Mil-spec is a minimum standard. 9310 if properly prepped exceeds mil-spec. |
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Posted: 11/10/2013 7:18:29 AM EDT
[#29]
Quote HistoryQuoted: Mil-spec is a minimum standard. 9310 if properly prepped exceeds mil-spec. Quote HistoryQuoted: Quoted: Quoted: BCM states : Milspec Carpenter No. 158® steel PSA premium: also states: Milspec Carpenter No. 158® steel bolt ?? Yes. Carpenter 158 is mil-spec; 9310 is not. 8620 is mil-spec for the carrier. The End. Mil-spec is a minimum standard. 9310 if properly prepped exceeds mil-spec. Quoted: Pissing contest happen all the time as to if its better or not. |
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Posted: 11/10/2013 8:29:35 AM EDT
[#30]
Quote HistoryQuoted:
I guess reading is not your forte
Quote HistoryQuoted:
Quoted:
8620 is shit for a bolt,
So the AIM carrier is 8620 so does that mean it is shit? Why don't they just make it out of the good carpenter 158 steel?
Well people are calling 8620 a shit material and not to buy 8620 so even if the carrier is made of it, it makes it sound as if it is made of sub par material. |
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Posted: 11/10/2013 8:38:04 AM EDT
[#31]
Well people are calling 8620 a shit material and not to buy 8620 so even if the carrier is made of it, it makes it sound as if it is made of sub par material Nearly every carrier is 8620, at least the good ones. It is just shit for bolt material. |
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Posted: 11/10/2013 8:39:21 AM EDT
[#32]
Haven't I read this thread before somewhere???
Oh yeah, right here. Like every two weeks for the past year. |
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Posted: 11/10/2013 10:51:21 AM EDT
[#33]
Quote HistoryQuoted:
Well people are calling 8620 a shit material and not to buy 8620 so even if the carrier is made of it, it makes it sound as if it is made of sub par material. You're missing the key part of that claim. A Ferrari is shit in the Baja, and a Ford Raptor is shit at Willow Springs. |
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Posted: 11/10/2013 5:15:23 PM EDT
[#34]
9310 is not better than C158 I'm a material science engineer who has talked extensively with engineers at a few firearms companies about possible employment and I asked about this and they all say that C158 is the best alloy at its cost for the job and any possible superalloy that could be better would be wickedly expensive. KAC has proven with the E3 bolt that no better alloy is needed, provided that the shape of the bolt and barrel extension is changed to reduce the stress areas cause by the 90 degree angles in the milspec drawing. Either way, 9310 will work perfectly fine for thousands of rounds. If you're super paranoid about 9310 cause it's not milspec, have your bolt MPIed every thousand rounds and replace it when it fails the MPI the first time (it will keep working for thousands of rounds after it fails MPI the first time anyways).
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Posted: 11/10/2013 5:51:01 PM EDT
[#35]
They are MPI tested. I bought one of these BCGs and I got to tell you it has been perfect so far. I have fired 0 rounds with it
 . But I hope its a good BCG but only time will tell I guess.
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Posted: 11/11/2013 7:07:05 AM EDT
[#36]
Quote HistoryQuoted:
Well people are calling 8620 a shit material and not to buy 8620 so even if the carrier is made of it, it makes it sound as if it is made of sub par material. Quote HistoryQuoted:
Quoted:
Quoted:
8620 is shit for a bolt,
So the AIM carrier is 8620 so does that mean it is shit? Why don't they just make it out of the good carpenter 158 steel?
Well people are calling 8620 a shit material and not to buy 8620 so even if the carrier is made of it, it makes it sound as if it is made of sub par material. 8620 is NOT a sub par material. PERIOD. 8620 is good for bolt carriers. It is specifically called for in the military specs. But 8620 is not good for BOLTS. Bolts and bolt carriers see very different stresses and loads, and are of very different geometries. The thing to remember is that "strength" is misleading when talking about metals. Different steel alloys act in different ways. Thus 8620 is a great steel, and great for bolt carriers. But it is not good for bolts. |
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Posted: 11/11/2013 8:30:56 AM EDT
[#37]
I have a 8620 bolthead floating around in my parts bin, I won't toss it because a 8620 bolthead beats no bolt head in an emergency.
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Posted: 11/11/2013 10:10:56 AM EDT
[#38]
Bolt snobs
I remember not that long ago when no one even talked about the type of steel they were made of. Everyone just went by brand name and figured if you got Colt, BCM, Stag or RRA, you were GTG. Then Spike's and PSA came out and those were GTG as well.
Just a few short months ago, one could've sold 8620 BCGs all day long for $200 each and no one would've questioned them. |
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Posted: 11/11/2013 11:14:13 AM EDT
[#39]
Quote HistoryQuoted:
Just a few short months ago, one could've sold 8620 BCGs all day long for $200 each and no one would've questioned them. thank goodness that's over. I've got a 55 gallon drum buried in the backyard filled with BCGs now.
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Posted: 11/11/2013 9:57:00 PM EDT
[#40]
Quote HistoryQuoted:
BCM states : Milspec Carpenter No. 158® steel PSA premium: also states: Milspec Carpenter No. 158® steel bolt ?? But PSA also states their bolts have fully machined 8620 extractors. What's the mil-spec for extractors? |
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Posted: 11/11/2013 10:17:55 PM EDT
[#41]
Quote HistoryQuoted:
Bolt snobs I remember not that long ago when no one even talked about the type of steel they were made of. Everyone just went by brand name and figured if you got Colt, BCM, Stag or RRA, you were GTG. Then Spike's and PSA came out and those were GTG as well.
Just a few short months ago, one could've sold 8620 BCGs all day long for $200 each and no one would've questioned them. False. Before there were all these idiots panic buying. And please don't compare Stag or RRA bolts to Colt or BCM. |
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Posted: 11/12/2013 7:14:10 AM EDT
[#42]
Quote HistoryQuoted:
False. Before there were all these idiots panic buying. And please don't compare Stag or RRA bolts to Colt or BCM. Quote HistoryQuoted:
Quoted:
Bolt snobs I remember not that long ago when no one even talked about the type of steel they were made of. Everyone just went by brand name and figured if you got Colt, BCM, Stag or RRA, you were GTG. Then Spike's and PSA came out and those were GTG as well.
Just a few short months ago, one could've sold 8620 BCGs all day long for $200 each and no one would've questioned them. False. Before there were all these idiots panic buying. And please don't compare Stag or RRA bolts to Colt or BCM. Can you please tell me what a Colt or BCM does that a Stag or RRA won't do to make them non-comparable? Other than batch checking instead of unit testing and HPT (which some people still debate whether HPT actually weakens the bolt during the test), I am not sure why we can't have a technical discussion comparing two brands if it relates to the materials or processes of the AIM bolt in the OP. |
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Posted: 11/12/2013 7:42:49 AM EDT
[#43]
Quote HistoryQuoted:
They're talking about Aim, not Spike's. ...But either way. Quote HistoryQuoted:
Quoted:
Quoted:
Quoted:
They don't use Carpenter 158. That kills it for Me. Logo kills it for me. They're talking about Aim, not Spike's. ...But either way. I know that.. Aim put their logo on a visible part of the carrier. 
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Posted: 11/12/2013 7:56:35 AM EDT
[#44]
Not all AIM bolts have logos. mine dont
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Posted: 11/12/2013 9:41:01 AM EDT
[#45]
Quote HistoryQuoted:
Not all AIM bolts have logos. mine dont |
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Posted: 11/12/2013 9:50:14 AM EDT
[#46]
Quote HistoryQuoted:
Not all AIM bolts have logos. mine dont The phosphate/black ones don't. The new nickel boron ones do |
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Posted: 11/12/2013 12:56:15 PM EDT
[#47]
Have only about 350-75rds on mine and friend has maybe a bit less in the high 2's low 3's..not many but the bolt have been as expected.
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Posted: 11/12/2013 10:08:16 PM EDT
[#48]
Quote HistoryQuoted:
Not all AIM bolts have logos. mine dont The ones linked in this thread are. |
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Posted: 1/3/2014 5:30:37 PM EDT
[#49]
Reviving an old thread because i just purchased one from AIM for a spare parts build(i had a bunch of spare parts laying around that could almost build a rifle, so i decided to make it complete with this bolt, charging handle, and stripped upper).
Aim probably read this thread and updated the description to appease people's concerns. http://www.aimsurplus.com/product.aspx?item=XAIMNiBBCGV2&name=AIM+NiB+.223%2f5.56+AR%2fM16+Bolt+Carrier+Group&groupid=723 Aim Surplus:
We are proud to announce the release of our V2 Nickel Boron AR/M16 .223/5.56 Bolt Carrier Groups. As always… If it has our name on it, we've got your back for life!* 8620 Tool Seel Enhanced Radius design (Angle Cut) Carrier with inside and out NiB Treatment 9310 Steel MPI Bolt with inside and out NiB Treatment Billet Machined Extractor with Black Insert and O-Ring upgrade Billet Machined 4140 Steel Gas Key Grade 8 Fasteners Military Specification Gas Key Staking I guess this is their V2 version. The gas key is machined and not MIM'd. The bolt is MPI and uses 9310 steel. |
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Posted: 1/3/2014 5:37:00 PM EDT
[#50]
Quote HistoryQuoted:
I've got a 55 gallon drum buried in the backyard filled with BCGs now.
lol...awesome |
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