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BCM's $59 commercial spec BCG (Page 2 of 2)
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Originally Posted By 03RN: https://www.ar15.com/media/mediaFiles/433221/1000004792_jpg-3757359.JPGhttps://www.ar15.com/media/mediaFiles/433221/1000004793_jpg-3757360.JPGhttps://www.ar15.com/media/mediaFiles/433221/1000004794_jpg-3757361.JPGhttps://www.ar15.com/media/mediaFiles/433221/1000004795_jpg-3757363.JPGhttps://www.ar15.com/media/mediaFiles/433221/1000004797_jpg-3757364.JPG Does yours have an extractor spring insert? Mine didn’t. I shot 3 mags through my latest build today. Does BCG things like it should. I got a Faxon 12.5 Midlength gas barrel that I was shooting so kinda a wierd one to try it with but it worked |
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Originally Posted By ScoutH57: Does yours have an extractor spring insert? Mine didn’t. I shot 3 mags through my latest build today. Does BCG things like it should. I got a Faxon 12.5 Midlength gas barrel that I was shooting so kinda a wierd one to try it with but it worked Originally Posted By ScoutH57: Originally Posted By 03RN: https://www.ar15.com/media/mediaFiles/433221/1000004792_jpg-3757359.JPGhttps://www.ar15.com/media/mediaFiles/433221/1000004793_jpg-3757360.JPGhttps://www.ar15.com/media/mediaFiles/433221/1000004794_jpg-3757361.JPGhttps://www.ar15.com/media/mediaFiles/433221/1000004795_jpg-3757363.JPGhttps://www.ar15.com/media/mediaFiles/433221/1000004797_jpg-3757364.JPG Does yours have an extractor spring insert? Mine didn’t. I shot 3 mags through my latest build today. Does BCG things like it should. I got a Faxon 12.5 Midlength gas barrel that I was shooting so kinda a wierd one to try it with but it worked Nope Its for my 7yo future rifle so next time I place an order ill get one |
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Originally Posted By the-answer-is-42: I see the black rubber insert in your photo - no? Originally Posted By the-answer-is-42: Originally Posted By 03RN: Nope Its for my 7yo future rifle so next time I place an order ill get one I see the black rubber insert in your photo - no? Sorry, yeah. I was thinking the o ring |
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Thank You for that link !!! |
*Hold on to your AR-15s. Their magic must be very powerful, or they wouldn’t want them.*
JAFOM.... Just another fat old man.
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JAFOM.... Just another fat old man.
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Originally Posted By the-answer-is-42: I have an aim slic nitride Bcg from the first run they did back in like 2013 and it’s still going strong with only new gas rings. I figure BCM wouldn’t sell something that’s garbage and they have to know behind the scenes where these came from and they have to be satisfied with the pedigree or they wouldn’t risk it but you never know I guess Same. One of the best BCG's I've ever bought. Probably pushing close to 5,000 rounds. Gas rings are obliterated and the bolt will move backwards if the wind blows but I never replaced them and it's still going strong. |
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Originally Posted By emb876: Same. One of the best BCG's I've ever bought. Probably pushing close to 5,000 rounds. Gas rings are obliterated and the bolt will move backwards if the wind blows but I never replaced them and it's still going strong. Gas rings are dirt cheap, it's a 5 minute job. Pieces of rings floating around in there are a liability. |
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Damnit, ARFCOM costs me $69 again. EDIT: Received it today. Exactly as described by other posts, no markings, dry phosphate finish, good chrome plating, cam pin greased. It is about to be used in an FRT blaster, so we shall see how well it holds up to that. |
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Originally Posted By 03RN: Because 9310 bolts and nitrided bcg suck Please explain why all bolts made out of 9310 suck. I guess you can never shoot any 6.8mm or any other high pressure cartridges, because all those bolts are made out of 9310. I personally don't own any because I only shoot 556. That being said, I wouldn't be afraid to own one as long as it's made by a quality company.And you know, it's properly, he treated. I also wouldn't be afraid to own a nitride carrier. Personally I prefer DLC chrome lined carriers and Colt Chrome Bolts because I shoot high back pressure cans. |
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Originally Posted By AS556: Just got a BCM marked BCG in a complete upper off their site and it has the exact same grease on the cam pin as the $59 ones. This leads me to believe BCM is at least assembling these BCGs in house. https://i.ibb.co/Q7s1yHZg/IMG-9014.jpg That is REALLY interesting. No one else does this, so this leads me to your conclusion that BCM is assembling these and sealing the plastic bags they come in after seeing your pics. The only conclusion I can reasonably draw from this, is that BCM was approached to make (or at least assemble) some BCG's for a contract (whether it be domestic, overseas, or for Ukraine as some have alluded) and it was either cancelled or modified leaving them with hundreds of extra BCGs to sell off that are not "BCM spec" as they would do for their laser-marked retail BCGs but are of similar quality. As I said, it could just be a contract to assemble them since BCM has such a robust QC/QA/assembly line and process, so the specs/batch specs could differ from that BCM would usually prefer which is why they stipulate the 'this is not a BCM BCG'. We also know that BCM lasers their bolts and carriers in house AFTER they QC them (you can see the blank carriers during the QC process in the Vickers tour video of BCM with Paul) so that means these could have been through the hands of BCM's assembly process just minus lasering at the final step before packaging. IMO given the evidence, these are whitelabel BCM BCG's (minus the QC process) from a cancelled contract. |
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Originally Posted By the-answer-is-42: IMO given the evidence, these are whitelabel BCM BCG's (minus the QC process) from a cancelled contract. I'm inclined to agree. Meanwhile, has anyone noticed there are "no reviews yet" on BCM's web site for these things? Seems odd. |
 Tossed one in this BKF chrome lined patrol upper. Only $250 with furniture. Nice little budget blaster, the Holosun ARO is nice. https://bkingsfirearms.com/shop/complete-upper-receivers/bkf-ar15-16-5-56-nato-1-7-twist-m4-patrol-series-complete-upper-receiver/ |
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Originally Posted By AS556: https://i.ibb.co/69J0237/IMG-9035.jpg Tossed one in this BKF chrome lined patrol upper. Only $250 with furniture. Nice little budget blaster, the Holosun ARO is nice. https://bkingsfirearms.com/shop/complete-upper-receivers/bkf-ar15-16-5-56-nato-1-7-twist-m4-patrol-series-complete-upper-receiver/ I am digging that build. Any idea who BKF uses for their barrels? |
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I was intrigued by this deal after picking up some BCM Blem uppers and reading this thread. So I picked up both the BCG and the stripped bolt carrier which arrived today. I compared them to a White Label Armory and a Microbest, to which the $59 BCG and stripped carrier appears right off the bat to have weak staking. The stripped carrier arrived wrapped nicely in plastic within a box and appears to have rust (maybe, it looks like it’s pitted), on the gas key. The BCG arrived in bubble wrap, plastic packaging and the thick white lithium-like grease on it like the others. https://docsend.com/view/s/qf3qv39zgjjgnt2q |
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Originally Posted By Boadicea: I was intrigued by this deal after picking up some BCM Blem uppers and reading this thread. So I picked up both the BCG and the stripped bolt carrier which arrived today. I compared them to a White Label Armory and a Microbest, to which the $59 BCG and stripped carrier appears right off the bat to have weak staking. The stripped carrier arrived wrapped nicely in plastic within a box and appears to have rust (maybe, it looks like it’s pitted), on the gas key. The BCG arrived in bubble wrap, plastic packaging and the thick white lithium-like grease on it like the others. https://docsend.com/view/s/qf3qv39zgjjgnt2q https://docsend.com/view/s/qf3qv39zgjjgnt2q I hope your stripped carrier works. I bought 3, and one of them won't even accept a bolt. I think I am past the return window with it. |
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Originally Posted By fenrisulfr: I thought MPI stood for magnetic particle inspected. I didn't know it is a brand. |
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Originally Posted By the-answer-is-42: It is what it means, but not all the time. A company named MPI is releasing MPI-lasered bolts that are not MPI inspected but are doing it because its their initials. https://www.mfg-partners.com/highvolume-products |
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I hope your stripped carrier works. I bought 3, and one of them won't even accept a bolt. I think I am past the return window with it. Ahhh that’s wild! I’m going to use mine with a headspaced bolt, perhaps I should have just bought another full BCG in that case. As for the rust, I did reach out to BCM over the weekend and had a reply promptly at 0600 this morning (Monday) and they immediately provided a shipping label. They said they’d ship a replacement in the meantime so I “wasn’t out for too long” lol A+ for customer service at least. However, in your case, it may not hurt to reach out to them to see if they’re willing to take care of you given that it isn’t working. |
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Originally Posted By Boadicea: Ahhh that’s wild! I’m going to use mine with a headspaced bolt, perhaps I should have just bought another full BCG in that case. As for the rust, I did reach out to BCM over the weekend and had a reply promptly at 0600 this morning (Monday) and they immediately provided a shipping label. They said they’d ship a replacement in the meantime so I “wasn’t out for too long” lol A+ for customer service at least. However, in your case, it may not hurt to reach out to them to see if they’re willing to take care of you given that it isn’t working. Originally Posted By Boadicea: I hope your stripped carrier works. I bought 3, and one of them won't even accept a bolt. I think I am past the return window with it. Ahhh that’s wild! I’m going to use mine with a headspaced bolt, perhaps I should have just bought another full BCG in that case. As for the rust, I did reach out to BCM over the weekend and had a reply promptly at 0600 this morning (Monday) and they immediately provided a shipping label. They said they’d ship a replacement in the meantime so I “wasn’t out for too long” lol A+ for customer service at least. However, in your case, it may not hurt to reach out to them to see if they’re willing to take care of you given that it isn’t working. That's good to know. Thank you. |
Be killing sin or sin will be killing you. -John Owen
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Originally Posted By Ursus_Americanus: Because 9130 didn't exist when "military spec" was written. And it's a minimum standard. Originally Posted By Ursus_Americanus: Originally Posted By 03RN: If 9130 was better why dont they use it? Because 9130 didn't exist when "military spec" was written. And it's a minimum standard. Neither did Pmags, heavy duty extractor springs, heavy duty extractor spring inserts, or the current spec lubricant. Things get upgraded if they’re an actual upgrade. All the commercial ‘upgrades’ are largely marketing garbage. |
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Originally Posted By CarlosC: For the sake of conversation, what makes this more appealing than offerings from other sources? BCM specifically says those are not their products, so what's the advantage in getting those? For $10 more, AIM has BCGs with an 8620 carrier and a 9310 bolt (heat treated, peened, MPI'd), plus the whole thing is nitrided. I have a few AIM BCGs in a couple of my ARs and no funeral for me yet. What makes any of BCM’s offerings more appealing? They have never made anything and source all of their parts from the same manufacturers every other commercial builder does. They just put a star on most of it. |
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Decided to order one up. I'll run it through pin gauge checks and post up anything interesting. |
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That man is a homo and a liar-TrojanMan
Hell, a Ford just breaks down on you. It doesn't fall apart AND try to kill you at the same time-Bloodsport2885
That man is a homo and a liar-TrojanMan
Hell, a Ford just breaks down on you. It doesn't fall apart AND try to kill you at the same time-Bloodsport2885
| Regarding the white grease, I just recently purchased a new BCM BCG (not the commercial one that this thread is about), and it too had a liberal coating of white grease around the cam pin hole. Any idea why BCM seems to all of sudden think this is a good idea? Wondering if I should start doing this as a habit. |
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I ordered a stripped carrier, and complete bcg. The stripped carrier seemed to gauge well, and appeared well staked. Finish was pretty light though, so I'd probably skip this one. The complete BCG seemed to gauge out well, staking was good, three bore was good. No real machining marks, and chrome looked good. Bolt was not marked in anyway, and the cam pin did not come greased. Not a bad deal for $60. Not certain I would trust it for a primary though. |
Callsign-ChuckYeager
That man is a homo and a liar-TrojanMan
Hell, a Ford just breaks down on you. It doesn't fall apart AND try to kill you at the same time-Bloodsport2885
That man is a homo and a liar-TrojanMan
Hell, a Ford just breaks down on you. It doesn't fall apart AND try to kill you at the same time-Bloodsport2885
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Originally Posted By M4ger: That's good to know. Thank you. Originally Posted By M4ger: Originally Posted By Boadicea: I hope your stripped carrier works. I bought 3, and one of them won't even accept a bolt. I think I am past the return window with it. Ahhh that’s wild! I’m going to use mine with a headspaced bolt, perhaps I should have just bought another full BCG in that case. As for the rust, I did reach out to BCM over the weekend and had a reply promptly at 0600 this morning (Monday) and they immediately provided a shipping label. They said they’d ship a replacement in the meantime so I “wasn’t out for too long” lol A+ for customer service at least. However, in your case, it may not hurt to reach out to them to see if they’re willing to take care of you given that it isn’t working. That's good to know. Thank you. I have to give BCM major props for their decisively fast responses via their contact us form. I had recently ordered some rail covers, both picatinny and keymod, and the picatinny cover was the wrong size and color. A quick email to them, and within 4 minutes, I had a reply. I sent them pictures of everything, and the rep made it extremely simple to get them returned. All I have to do is print out the email chain, and fill out the RMA form. Items are going back to WI on Tuesday as the missus and I are going on a short trip this weekend. I've always heard that BCM has had fantastic service if needed. Today, I am grateful for their help. |
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Originally Posted By M4ger: what size pin gauge did yours end up working with? It gauged on the tight end on all specs. Actual results: 3 bore .531 bolt bore .500 gas rings bolt tail takes .250+ gauge, does not take .251 minus gauge .312+ bolt cam pin .380 bolt face .180- gas key wont take .182 - Chrome was good, finish good, and bolt good. The stripped carrier also gauged well but the finish was way lighter than the complete one. I'd probably not buy one again, unless you happen to have a spare bolt around already. Bcg did not have a greased cam pin. Pulled my specs from here https://www.youtube.com/watch?v=DbeMnS3R9iA&t=171s and here https://www.ar15.com/forums/AR-15/-ARCHIVED-THREAD-Dimensions-to-use-in-gauging-wear-on-BCG-components-/118-748930/?page=2 |
Callsign-ChuckYeager
That man is a homo and a liar-TrojanMan
Hell, a Ford just breaks down on you. It doesn't fall apart AND try to kill you at the same time-Bloodsport2885
That man is a homo and a liar-TrojanMan
Hell, a Ford just breaks down on you. It doesn't fall apart AND try to kill you at the same time-Bloodsport2885
BCM's $59 commercial spec BCG (Page 2 of 2)
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