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Old 10-10-2013, 12:46 PM   #41
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Originally Posted by sweeper22 View Post
I've seen and used enough to feel BCM is of higher than average quality.

But the first question I might ask, is whether your S&W's BCG has an M16 carrier? If it's not (I believe most S&W's don't), that would make it immediately different. Is the S&W's bolt Carpenter 158 steel?

I'm not certain of the answers to these questions and only ask to point you in the direction of answering your own question. A lot of cheap AR parts and expensive/trendy options are made under the same rooves. And in some cases I'd imagine you're right about there being a great deal of overlap with regard to actual quality. But BCG's are a bit of a different monster in my opinion. The specific materials, testing, tolerances, etc can vary greatly.
Mine absolutely is not an M16 bolt. I just read numerous places that this company makes AR15 bolts for the companies mentioned. M16s bolt groups could be made somewhere else for all I know

don't get me wrong I know there are vast differences in quality etc out there for everything we buy. I just suspect that there is no difference between a BCM AR15 BCG and a S&W or a Colt. Considering those all seem to be pretty decent manufacturers (per the usual suspects on these threads), I'd suspect they would all be happy to include a quality product in their rifles.
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Old 10-10-2013, 01:21 PM   #42
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Heres a good chart

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Old 10-10-2013, 04:11 PM   #43
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Mine absolutely is not an M16 bolt. I just read numerous places that this company makes AR15 bolts for the companies mentioned. M16s bolt groups could be made somewhere else for all I know

don't get me wrong I know there are vast differences in quality etc out there for everything we buy. I just suspect that there is no difference between a BCM AR15 BCG and a S&W or a Colt. Considering those all seem to be pretty decent manufacturers (per the usual suspects on these threads), I'd suspect they would all be happy to include a quality product in their rifles.
But you've just said yours is not an M16 BCG, so there IS a difference. No doubt a S&W unit is good, and certainly much better than the stuff littering the right side of the M4 Compatibility Chart that Havoc posted ... but BCG, barrel, etc., S&W does fall short of BCM and Colt. And my AR based on a S&W M&P-15 stripped lower has better parts than a factory S&W because I made certain it does, for example a Daniel Defense upper, including BCG.

Let's put it this way... I would not trade my BCM or Daniel Defense BCG with you.
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Old 10-10-2013, 04:23 PM   #44
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Let's put it this way... I would not trade my BCM or Daniel Defense BCG with you.
lol I wouldn't make that trade either (it's my first AR, we are becoming attached let's say)
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Old 10-10-2013, 04:24 PM   #45
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As a huge S&W fan, their BCG's are better than other AR15 BCG's. That being said, they are not better than an M16 BCG.

It's 8620 steel, not 158 carpenter. S&W BCG's are no match for BCM stuff. However, their BCG's are heavier than most other 8620 BCG's.

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Old 10-10-2013, 11:52 PM   #46
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I think there's some confusion here.

Just to be clear, the Bolt is the primary focus here. Bolts are made of Carpenter 158, 9310, 8620. Don't worry about what the carrier is made out of. Even semi auto or fa carriers really don't make a big difference. The carrier does wear, but its composition is pretty negligible as just about any steel is harder than aluminum so your reciever will wear out long before your carrier.

I'm kinda suprised they haven't made a polymer carrier yet......

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Old 10-11-2013, 02:13 AM   #47
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Quote:
Originally Posted by AgentTikki View Post
I think there's some confusion here.

Just to be clear, the Bolt is the primary focus here. Bolts are made of Carpenter 158, 9310, 8620. Don't worry about what the carrier is made out of. Even semi auto or fa carriers really don't make a big difference. The carrier does wear, but its composition is pretty negligible as just about any steel is harder than aluminum so your reciever will wear out long before your carrier.

I'm kinda suprised they haven't made a polymer carrier yet......
That could be your get rich quick scheme.. LOL!
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Old 10-11-2013, 02:09 PM   #48
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Heres a good chart

Your chart, plus this graphic, does a good job of explaining the carrier design differences. The AR carriers with a shrouded pin and a complete closed circle on the buffer-side (like the S&W I have) weigh in at 9.3 vs 9.6 oz for the M16 design. Very small overall weight difference, but the 'cheapest' version, with exposed pin and no closed circle, are over an ounce lighter.

I'm going to save my pennies and get the full profile M16 bolt, and keep that S&W as a very trusted spare
ar15carriers.jpg  
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Old 10-16-2013, 06:05 PM   #49
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Quote:
Originally Posted by chloeshooter View Post
Your chart, plus this graphic, does a good job of explaining the carrier design differences. The AR carriers with a shrouded pin and a complete closed circle on the buffer-side (like the S&W I have) weigh in at 9.3 vs 9.6 oz for the M16 design. Very small overall weight difference, but the 'cheapest' version, with exposed pin and no closed circle, are over an ounce lighter.

I'm going to save my pennies and get the full profile M16 bolt, and keep that S&W as a very trusted spare
Never hurts to have spare stuff , Alot of times it will turn into another rifle but hey you already have the parts so why not LOL

Couldnt agree more about having a spare , I always pack spare gas rings, firing pin etc in my bag but its much easier to just throw another BCG in the gun a roll on . Break downs suck !!!
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Old 10-16-2013, 06:20 PM   #50
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I just suspect that there is no difference between a BCM AR15 BCG and a S&W or a Colt. Considering those all seem to be pretty decent manufacturers (per the usual suspects on these threads), I'd suspect they would all be happy to include a quality product in their rifles.
stupid statement I made there. The designs are different, Bravo's is the M16 profile w different materials than S&W, which at least in my rifle is the enhanced AR profile. Maybe splitting hairs but the bolt itself is not as good
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