AR15.Com Archives
 bolt carrier group BCM -vs- RRA Chrome
Shooter_G22  [Member]
2/9/2011 1:50:40 AM
been debating which one to go with on a build i have been accumaling parts for...
not going to be an expensive build... in fact i asked in another thread about which upper i should get and i was thinking of going with a DPMS BCG
but i decided to go with one of these two...

leaning more toward the RRA Chromed bolt that... but... wanted to ask if the "Bravo Co." BCG was better...????

What are the differances.. and.. the pro's and con's of the two...
all comments and opinions needed here???
thanks in advance

Combat_Jack  [Team Member]
2/9/2011 2:11:36 AM
BCM is top notch and always properly staked. My first choice.
Black-Tiger  [Team Member]
2/9/2011 2:14:25 AM
Originally Posted By Combat_Jack:
BCM is top notch and always properly staked. My first choice.


Same here.
demusn1979  [Team Member]
2/9/2011 6:42:34 AM
BCM.
usagold  [Team Member]
2/9/2011 7:01:57 AM
nothing wrong with the RRA chrome bolt carrier group. For fit, finish and $$$$ you just cant go wrong with RRA.
AROptimus  [Member]
2/9/2011 7:29:16 AM
RRA works, but I'm not a fan of chrome bcgs, so I'll have to go w/ BCM!
Overton-AR  [Team Member]
2/9/2011 10:00:03 AM
I have 6 AR's and all 6 of them have BCM bolt carriers. Only 4 of them have BCM bolts, but thats
just because Bravo Co. doesn't make a 6.8 SPC bolt.
warpig8654  [Team Member]
2/9/2011 11:20:21 AM
BCM>RRA.
Shooter_G22  [Member]
2/9/2011 11:39:08 AM
Wow... I would have imagined it the other way... i would have figured that the RRA bolt carrier group in chrome would have been the better deal just becuase it was chrome.. isnt the chrome supposed to be a better bolt??? i'm not trying to be sarcastic here i just really dont know these things... and i am very curoiuse...
i might have screwed my self over... i was up tossing ans turning last night and couldnt sleep that i went ahead and ordered the RRA BCG last night... i figured the chrome had to be better... considering it's original price was more than that of the BCM and Other Companys that have Chrome BCG's are also more expensive... soooo i thought that ther was something that made them better or perform better...

but know i'm begining to think that i should have went the other way... i will for sure get a BCM next time... i was really close to ordoring it this time just cuase i like the fact that it is a M16 bolt.... just a little more beefier looking and looks like it is more durable than that of a regular semi bolt...

i am very curriouse as to why everybody would choose that one... i should have gotten it... i ordered the Bravo Co. blem upper yesterday and was going to get the bolt too... but i thought that the RRA would have been better... now im kicking myself in the hinny for not getting it
** can anybody break it down why.. the BRAVO CO. BCG is better than the RRA chrome.... **
Bretshooter  [Member]
2/9/2011 12:53:46 PM
mi8lspec steel, mag particle tested. Probably other reasons.

Chrome might make a bolt clean a bit easier, but the steel underneath is what makes a bolt good, not a coating.

That said, the RRA bolt is a fine example of a commercial bolt and should give a long life.
durabo  [Member]
2/9/2011 1:20:46 PM
As stated, the BCM is a technically better BCG on paper.

BCM is made from the milspec materials and tested properly individually.

The RRA is made from the proper milspec materials (i think) and batch tested... meaning they will check like 1 out of a hundred, or 1 out of a thousand, or whatever their numbers are.

BCM also always comes properly torqued and staked, RRA has had some issues in the past with im properly staked ones... don't know if they have had any torque issues (which is the more important of the two)

RRA may or may not be slightly oversized which could lead to issues in function (no hard data on that, just my observation from a few different reports and personal experience with RRA BCGs) Some people falsely believe that slightly oversized BCGs and tighter tolerances in upper to lower fit and things like that contribute to increased accuracy... this is false, but RRA still makes their products with tighter tolerances anyways for that reason.

Chrome is going to do nothing for you except make it easier to clean. You still must oil and maintain it the same as the BCM

Youll be fine with the RRA, don't lose sleep over it.
Primos  [Member]
2/9/2011 1:23:17 PM
Originally Posted By Shooter_G22:i would have figured that the RRA bolt carrier group in chrome would have been the better deal just becuase it was chrome.. isnt the chrome supposed to be a better bolt???


No. But it does help sell shiny stuff to the masses.
jaqufrost  [Team Member]
2/9/2011 1:44:03 PM
Don't worry about it. The RRA is unlikely to cause any problems. If it shoots fine don't worry about it.
Gary-G23  [Member]
2/9/2011 2:11:14 PM
Here are BCM's specs:
* Milspec Carpenter No. 158® steel
* HPT Bolt (High Pressure Tested/ Proof)
* MPI Bolt (Magnetic Particle Inspected)
* Shot Peened Bolt
* Chrome Lined Carrier (AUTO)
* Chrome Lined Gas Key
* Gas Key Hardened to USGI Specifications
* Grade 8 Hardened Fasteners
* Key Staked Per Mil-Spec
* Tool Steel Extractor
* BCM Extractor Spring
* Black Extractor Insert
* Mil-Spec Crane O-Ring

Compare those with RRA if they are not ashamed to post them.

I've also found it is best to ask questions BEFORE I order something.
Combat_Jack  [Team Member]
2/9/2011 2:21:40 PM
I suggest that you buy the BCM extractor upgrade kit and make sure the key is properly staked.
Cruz5350  [Member]
2/9/2011 11:26:17 PM
My BCM just came it sure is purty and I wouldnt go any other way.
diaz_aa  [Team Member]
2/9/2011 11:53:46 PM
You will be fine with that nice chrome RRA bcg. Now post some pictures damnit!!!
Wolf_Spyder  [Member]
2/10/2011 12:21:00 AM
STOP !!!

The BCM BCG is the only way to go.

The bolt assembly is machined from the correct Mil-Spec Carpenter No. 158® steel, then shot peened for increased strength, includes tool steel machined extractor and ejector, BCM Extractor Spring, and is HPT (High Pressure Tested) and MPI (Magnetic Particle Inspected). The bolt carrier group (auto version) for your AR15, M16, or M4. Parkerized exterior and chrome lined inside carrier. Machined to USGI specifications. This M16/M4 carrier includes the proper Mil-Spec gas key. Gas key is chrome lined and heat treated per GI specifications. Gas key is secured to carrier via USGI domestic mfg Grade 8 fasteners and properly staked per Mil-Specs. These properly hardened parts insure a strong staking and proper gas system functioning.

Rock River Arms is just not in the same league as BCM. The stuff from RRA is not true Mil-Spec at all. It might be the correct size & shape, and will interchange with a true Mil-Spec part, but it is not made of true Military Spec matterial, nor is it tested and inspected to the true Mil-Spec standards. Hands down the BCM part is more durable and will last longer.

Milspec Carpenter No.158 steel
HPT Bolt (High Pressure Tested/ Proof)
MPI Bolt (Magnetic Particle Inspected)
Shot Peened Bolt (for strength)
Chrome Lined Carrier (Auto version)
Chrome Lined Gas Key
Gas Key Hardened to USGI Specifications
Grade 8 Hardened Fasteners
Key Staked Per Mil-Spec
Tool Steel Extractor
BCM Extractor Spring
Black Extractor Insert
Mil-Spec Crane O-Ring

RRA just can not compare, period.


devinsdad  [Member]
2/10/2011 9:51:29 PM
I have never seen a bolt carrier break, no matter what the manufacturer....ever. I have seen extractors break, springs break, bolt lugs break and pins shear....but never seen one "break". Those are ALL confined to the bolt and can and will happen to any bolt if run hard and long enough. The chrome coating will make it easier to clean....and thats all, no more no less. Worring about it is silly. Perform regular maintenance, lube properly and replace small parts when needed. BCM, RRA both will run fine and give years of service without fail. Also, the M16 vs. AR15 carrier arguement is only importent if you have a Class 3 rifle. Thank Colt for cutting that chunk out of the carrier.
Shooter_G22  [Member]
2/10/2011 11:39:46 PM
Originally Posted By devinsdad:
I have never seen a bolt carrier break, no matter what the manufacturer....ever. I have seen extractors break, springs break, bolt lugs break and pins shear....but never seen one "break". Those are ALL confined to the bolt and can and will happen to any bolt if run hard and long enough. The chrome coating will make it easier to clean....and thats all, no more no less. Worring about it is silly. Perform regular maintenance, lube properly and replace small parts when needed. BCM, RRA both will run fine and give years of service without fail. Also, the M16 vs. AR15 carrier arguement is only importent if you have a Class 3 rifle. Thank Colt for cutting that chunk out of the carrier.


yeah, i agree with ya there i have never seen one break... hell not even when i was in the Marine Corps have i ever had a bolt break on me not even an extractor... and hell i shot the shit out of my A2... guess i've been lucky so far.. i dont know why i've been so anal about this trash lately... i guess i just wanted to get the best BCG my hard earned $ could get...
i orderd the RRA bolt the other night but my credit card has yet to be charged if i dont see the charge by tomorrow im going to give em a call.. if the order hasnt gone through then i'm going to see if i can cancel the order and get the BCM... if not then im sure the RRA will do just fine... hell i always wanted a chrome bolt since befor i knew who BCM was anyway....
as for the chrome bieng easier to clean... thats not a big deal to me... i always clean after firing and always spend about the same time on them anyways no matter if they are filthy or just a little dirty... just used to scrubbing with that clp and ap brush anyways... so no big deal about the chrome for me... i just thoought for some reason it would perform better for the coating... hell i'm probably going to polish the rails anyway... i always do that to every new bolt i get anyhow.!!
devinsdad  [Member]
2/11/2011 9:13:07 AM
You asked the question and feel unsure about your order because of looking around in here......thats all. There are sooo many BCM fanboys here it isnt funny. Now, truth be told, they make great parts and will last as long or more than the RRA. That being said, the RRA is a great component in it's own right and will work fine. Don't get parts bullied into one or the other. I have found that there are a lot of kids and people who, while they don't actually own an AR, they love to post about how their dream AR would be put together...and then bust on others whose rifle doesn't live up to that dream. Be happy with the RRA, or BCM. They'll both do the job fine and give many years of service. Which one was the better deal?
durabo  [Member]
2/11/2011 11:39:11 AM
Originally Posted By devinsdad:
You asked the question and feel unsure about your order because of looking around in here......thats all. There are sooo many BCM fanboys here it isnt funny. Now, truth be told, they make great parts and will last as long or more than the RRA. That being said, the RRA is a great component in it's own right and will work fine. Don't get parts bullied into one or the other. I have found that there are a lot of kids and people who, while they don't actually own an AR, they love to post about how their dream AR would be put together...and then bust on others whose rifle doesn't live up to that dream. Be happy with the RRA, or BCM. They'll both do the job fine and give many years of service. Which one was the better deal?


Now see... that is the problem right there.

You can't tell which one is the better deal, because while BCM lists all of the specs of their BCG's and they follow the technical guidelines of the Milspec, and RRA doesn't.

How can you TELL which is the better deal, when you have no idea what RRA even makes their BCG's out of? And how they test it?

I am not a BCM fanboy by any means, and you'll never see a BCM logo on my rifle... but until RRA starts posting certifications on their parts, they are the inferior product by default.
Shooter_G22  [Member]
2/11/2011 12:30:04 PM
well the Rock River was/is $130.00 bucks with free shipping... and the Bravo Co... is $139.95 + 9.95 shipping... So a grand total of $149.90 almost 20 dollars more than that of the Rock River Arms, Chromed, Bolt Carrier Group....
so in short the Rock River Arms... in my opinion is the better deal... becuase its 20 dollars less and its "chromed" i have another rifle here that i built last year... that is built on a RRA Stripped lower and then i bought a RRA complet upper for it... and when i bought it the vender at the Gun show showed me the differance on RRA's bolts when they build a rifle their Standard Bolt Carrier's Come polished on the bottem the portion that would recock the hammer, she said that rock river does that to all thier BCG's when i noticed that i started doing that to all my BCG's and then i took it a step further and started polishing the rails on the BCG's and even the bolt lugs... and of coarse the firing pin... i polish the gas tube and even the lugs on the charging handle to make them run really smooth... i do alot of tinkering to my rifle's to make them run a little more to my liking
so no matter what BCG that i end up using, it is still going to get worked over a little bit, to make it run the way i like them too...
thanks for the advise and reassurance, and i think your right..
Bretshooter  [Member]
2/11/2011 1:04:23 PM
You polish the gas tube?
Shooter_G22  [Member]
2/11/2011 3:05:00 PM
yeah, absolutely...

the outside of the Gas Tube goes into the gas key right...??? yes i polish the crap out of that part of the gas tube even if it gets dirty i still like to think that becuase its polished it goes in and out of that gas key a little smoother... if i could i would polish the inside of the gas key, and i have thought of it... but i dont really have anything that i could polish it with...
Combat_Jack  [Team Member]
2/11/2011 3:10:28 PM
Research hydrogen embrittlement.