What do I gain, BCM Bolt Carrier Group

Discussion in 'AR-15 Discussion' started by connectegr, Jun 12, 2012.

  1. connectegr

    connectegr New Member

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    I am beginning to drink the BCM kool-aid. I added a BCM Gunfighter charging handle, which is simply a great design idea, that works. I also looked at the BCM BCG (auto). My rifle has run flawlessly, so what will I gain from the "upgrade"? My current BCG does not have the heavier profile of the auto version. I know I won't gain auto fire from just the BCG, but are there other advantages to the design? Does the additional weight increase recoil or internal wear?
     
  2. AgentTikki

    AgentTikki New Member

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    Full auto carriers have a shroud that protects the firing pin while the bcg is cycling. A heavier bcg slows down the timing, though it really doesn't make that much of a difference as the weight difference between a FA & SA is tiny.
     

  3. JonM

    JonM Moderator

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    more weight means more positive feeding from the increased inertia. it also eliminates any carrier tilt which can happen and is a frequent cause of feed issues.

    the bcm bcg are all milspec and individually tested. the bolts are hardened by shotpeening which means they are typically going to last into the 25-30k range before needing replacement. most non peened bolts last 5-10K. they come fitted with the black inserts and with the o-rings in the bag as an option needed to ensure ultra reliable extraction in carbines. the orings go around the extractor spring under the extractor.

    i think they are a no brainer and bcm has em in stock get one or two while you can.
     
  4. connectegr

    connectegr New Member

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    Does increased inertia for feeding not also create increased inertia in the other direction, as recoil?
     
  5. JonM

    JonM Moderator

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    no, it decreases recoil by soaking up more of the recoil forces. makes for very slightly softer shooting. my colt sp1 carrier is noticably harder recoil than when i put a auto carrier in it as the sp1 is missing a LOT of metal
     
  6. XxChino13xX

    XxChino13xX New Member

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    So quick question then, and I'm not trying to start any wars, just curious to know the answer. For me, would it be viable to change to the BCM BCG? Coming from a DDM4V3 BCG?
     
  7. JonM

    JonM Moderator

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    just to change?? no. the DD bcg is a good set of parts. as a backup?? its always a good idea to have a spare if you can swing it. any rifle can and does break. things to keep on hand are a spare bolt (even better full bcg), fire control group, all other small parts pins detents and springs.
     
  8. Quentin

    Quentin New Member

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    I agree with Jon the DD and BCM BCGs are top quality - and I do have both. As far as a backup, a spare is a good idea but I wouldn't just to "upgrade" the DD bolt. I also keep a spare LPK and extractor kit and other small parts - just in case.
     
  9. XxChino13xX

    XxChino13xX New Member

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    Awesome, thanks for the input y'all, I appreciate it. Definitely something to think about, as far as starting a backup stash of parts and such. I guess I've pretty much got my AR to where I want it to be , besides an optic. Figure, it's time to start thinking laterally.
     
  10. AgentTikki

    AgentTikki New Member

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    I had a spare lpk from PSA (w/o fcg) as well as a spare bolt and extractor kit. Unfortnately they found their way into a stripped lower......dunno how that happened........now I have to buy another set of spares, but I'm scared. Damn spares keep disappearing on me.....:rolleyes:
     
  11. Quentin

    Quentin New Member

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    Same thing happed here. Its like Re-Animator deja vu - over and over again! :p
     
  12. MikeJK

    MikeJK New Member

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    My thinking = spare rifles > spare parts.
     
  13. Quentin

    Quentin New Member

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    My thinking too! Much faster to grab another working rifle than dick around with a broken one when seconds count.
     
  14. AgentTikki

    AgentTikki New Member

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    ...... I c what you guys done there...... :p