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Thread: Problem with a new BCM lower

  1. #141
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    This thread has run its course in my mind. The bottom line is this;

    If you want to enjoy the enhancements the gen 3 pmag has to offer, be careful on which lower you use.

    If you use a BCM, which is an outstanding quality lower, be mindful that it is on the tighter end of the magazine well spec at the rear and you MAY not be able to easily seat fully loaded 30rd gen 3 pmags on a closed bolt.

    I'm thinking we're fuggin done here, as debating the extensive engineering that went into the gen 3 pmag is pretty intelligence insulting as Duane and Rich Fitzpatrick have shared extensively regarding the design, materials, and extensive real world testing that has gone into the gen 3 pmag.

    As always, caveat emptor when building your loadout kit. Test and verify that EVERYTHING WORKS. Everybody seems to agree that not every plate carrier will work for every setup, so let's get over the noise in this thread.
    "That thing looks about as enjoyable as a bowl of exploding dicks." - Magic_Salad0892

    "The body cannot go where the mind has not already been."

  2. #142
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    Quote Originally Posted by Wake27 View Post
    I've always heard a strong debate about placing your mag on the ground while shooting because it'll cause malfunctions. His post left me with the impression that the tab helps prevent that.


    Sent from my iPhone using Tapatalk
    I shoot prone on the mag a LOT, never had an issue with any g.i. Mag or Pmag whatsoever.

    I'm not a member of a country club either.

  3. #143
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    Quote Originally Posted by Wake27 View Post
    I've always heard a strong debate about placing your mag on the ground while shooting because it'll cause malfunctions. His post left me with the impression that the tab helps prevent that.


    Sent from my iPhone using Tapatalk
    One of the people in my old work unit experienced a lot of malfunctions with his Colt when resting a GI magazine on the ground. Other people who fired the weapon with the magazine resting on the ground did not have malfunctions. I have a feeling he put a lot more downward, forward or backward pressure on the magazine than other people I had fire the weapon.

    Maybe the tabs would have helped in his case?
    Train 2 Win

  4. #144
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    Quote Originally Posted by samuse View Post
    I shoot prone on the mag a LOT, never had an issue with any g.i. Mag or Pmag whatsoever.

    I'm not a member of a country club either.
    Do it hard enough, with enough adrenaline, and maybe some added stress from working inside an unknown time limit or from receiving fire and you'll eventually have one.

    I guarantee it.

    I mean, I hope you never have one when it counts, brother. I mean that. But I've personally witnessed too many in dynamic FoF training and actual OIS's with std aluminum mags from colt/NHTMG/D&H/etc, yet none using the gen 3 pmag.
    "That thing looks about as enjoyable as a bowl of exploding dicks." - Magic_Salad0892

    "The body cannot go where the mind has not already been."

  5. #145
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    This is all on top of the fact that the over-insertion tab is also there to protect the feed lips and spine from bashing the BCG during hard use, not just prevent malfunction from prone shooting and stuff. I wonder if this is an enhancement even aluminum mags could benefit from over time.

  6. #146
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    And don't forget that the Gen M2s have an over-travel stop on the front.

  7. #147
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    Part of the problem here is that both components deviated from the TDP. The end goal of each was (is?) to make an improvement. Issues can come up from the deviations that aren't in consideration of each other. When conflicting modifications from an deviation from TDP, issues can happen, then who is to blame? Sometimes there is an overall consensus, but more likely vague.
    This is in no way meant to seem like a deviation from TDP can not improve things. It's more of a stress of how changes could have unintended consequences

  8. #148
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    I had a Seekins lower that wouldn't take Pmags. Just too tight. I sent it back and they opened it up a bit. It was tight as shit, so I sold it. It worked but mucho tight.

    You did the right thing IMHO, sell it and buy one you have 100% confidence. And can use on patrol. Sometimes you gotta take a hit and press on. I have two BCM's that eat everything. But I would still do as you did.


    LMT is top shelf and their CS has been excellent.
    Last edited by Pappabear; 07-14-15 at 07:42.
    "Air Force / Policeman / Fireman / Man of God / Friend of mine / R.I.P. Steve Lamy"

  9. #149
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    Quote Originally Posted by tom12.7 View Post
    Part of the problem here is that both components deviated from the TDP. The end goal of each was (is?) to make an improvement. Issues can come up from the deviations that aren't in consideration of each other. When conflicting modifications from an deviation from TDP, issues can happen, then who is to blame? Sometimes there is an overall consensus, but more likely vague.
    This is in no way meant to seem like a deviation from TDP can not improve things. It's more of a stress of how changes could have unintended consequences
    Interesting. Can you tell us how you know that the BCM lower has deviated from the TDP???



    C4

  10. #150
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    the area in question is, apparently, not stipulated by the TDP. I think tom means Colt when he says TDP. While the BCM lower may adhere to the stipulated confines of the TDP, a portion of the lower's geometry deviates from the geometry of a colt lower. That same area happens to be the area that is contributing to the magazine seating issue etc. While the lower doesn't technically deviate from the TDP (only because TDP doesn't get specific about the area in question), I think tom still brings up a valid point.

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