School Me Quickly RE: Complete Bolt Carrier Assemblies [Archive] - Glock Talk

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doc540
01-17-2011, 09:34
I need a complete bolt carrier assembly for a non-LEO, non-combat upper, so are all these $100-$150 units by RRA and DS Arms, etc "good enough"?

The gun probably won't see 1,000 rounds in a year, just a dedicated plinker.

I know to look to see if they're staked properly, but what else, if anything, is critical?

And my gun's a .223, so are all assemblies compatible or are some 5.56 only?

I appreciate you educating a hobbyist like myself.

faawrenchbndr
01-17-2011, 09:38
A RRA bolt carrier group will be fine.

mvician
01-17-2011, 10:53
If you are going to settle for "good enough" for up to $150, get one of the best for $140


http://www.bravocompanyusa.com/BCM-Bolt-Carrier-Group-MPI-Auto-M16-p/bcm%20bolt%20carrier%20group%20auto%20mp.htm




Sale Priced !

BCM® (MPI) complete bolt carrier group is fully assembled.

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.
The bolt assembly is machined from the correct Mil-Spec Carpenter No. 158® steel, 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).



Written by Bureau of Alcohol, Tobacco, Firearms and Explosives (BATFE), Chief of the Firearms Technology Branch
...M16 bolt carriers are not designed and intended solely and exclusively for use in converting a weapon into a machinegun and are not any combination of parts from which a machinegun can be assembled. Further, an M16 bolt carrier is not a firearm as defined in the GCA or a machinegun as defined in the NFA. An M16 bolt carrier is simply a machinegun part and as such its domestic sale and possession is unregulated under the Federal firearms laws. It is not unlawful to utilize a M16 machinegun bolt carrier in a semiautomatic AR15 type rifle.








Features

* 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

Gary G23
01-17-2011, 18:50
I have to agree with mvician. Even if I didn't rely on my carbine for home defense why would I want something that doesn't work?

mjkeat
01-17-2011, 19:01
Dont pay for "good enough" when you can have "kicks ass" for less.

jrs93accord
01-17-2011, 19:22
If you are going to settle for "good enough" for up to $150, get one of the best for $140


http://www.bravocompanyusa.com/BCM-Bolt-Carrier-Group-MPI-Auto-M16-p/bcm%20bolt%20carrier%20group%20auto%20mp.htm

I will agree here. Why not pay a few more dollars and get one of the best BCGs you can buy?

jdodd
01-18-2011, 07:23
I have had an itch to try out one of Rainiers thunderbolt bcgs but they are out of stock.
http://www.rainierarms.com/?page=shop/detail&product_id=2012

With that said...my go to answer for "what bcg should I get?"

BCM...

-J

NeverMore1701
01-18-2011, 08:28
Yes..

SNoB
01-18-2011, 18:21
I have to agree with the masses even though I am new to the AR platform. The BCG is one of the few parts where the cost to upgrade to "top of the line" isnt that much. I would go with the BCM.

Burncycle
01-19-2011, 13:05
I went with a BCM and loved it. Had to sell the rifle unfortunately, and the guy went off about how my M-16 BCG would land me in jail and how he had a form 4 so he'd buy it anyway but "just for future reference people have been prosecuted" >_>

I was tempted to say "who?" but I held my tongue

NeverMore1701
01-19-2011, 13:14
I went with a BCM and loved it. Had to sell the rifle unfortunately, and the guy went off about how my M-16 BCG would land me in jail and how he had a form 4 so he'd buy it anyway but "just for future reference people have been prosecuted" >_>

I was tempted to say "who?" but I held my tongue

Some people :upeyes:

Durden
01-20-2011, 00:34
I went with a BCM and loved it. Had to sell the rifle unfortunately, and the guy went off about how my M-16 BCG would land me in jail and how he had a form 4 so he'd buy it anyway but "just for future reference people have been prosecuted" >_>

I was tempted to say "who?" but I held my tongue

There are dumbasses all around us.