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Thread: Barrel movement?

  1. #11
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    Quote Originally Posted by AKDoug View Post
    I can take the barrel and the MFR tube on my DDM4V7 and flex the two towards each other just using thumb and index finger strength. It springs right back. I have no clue if the barrel or the tube is flexing, but it's not loose.
    Aluminum tubes are really stiff - think of an aluminum bicycle frame, which are much stiffer than steel, titanium and most carbon fiber ones. I'm clearly no metallurgist or engineer, but I'd be really surprised if it wasn't only the barrel flexing. It's pretty easy for me to flex/deflect the barrel on my MK18 LW. The primary reason FF tubes/rails exist is to eliminate the flexing/deflection of the barrel when force is imparted on the forend.

  2. #12
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    I wasn't really clear in my post. It was to inform the original poster that perceived movement may not be a big issue at all. My rifle never gives me any accuracy issues.

  3. #13
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    Re: Barrel movement?

    Quote Originally Posted by cazelle24 View Post
    I recently built my M4 and needed to know if there should be any barrel movement?
    Seriously?

    Sent from my Motorola DynaTAC 8000X using Tapatalk 2
    Quote Originally Posted by JSantoro View Post
    Stop dicking the dog, please. It's gross.

  4. #14
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    Im not new to AR's, ive read in other posts that some barrels flex and thats normal. I came here to recieve infomation not a lecture.
    Thanks to all who wasnt a jerk.

  5. #15
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    Barrel flex or movement?
    What exactly do you mean by movement?
    You left a lot to interpretation.
    Perhaps you should articulate you question in a way that is can be answered.
    What is you experience with AR's?
    Seems to me that some one with extensive experience assembling uppers wouldn have to ask a question like this.
    Quote Originally Posted by scottryan View Post
    Anybody that owns or sells pistol versions of assault rifles is a bottom feeder, irregardless of the ban status of certain ammunition.

    They are illigetimate weapons that have no real purpose other than to attract retards to the gun community.

  6. #16
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    Re: Barrel movement?

    Based on the description it sounds normal.

  7. #17
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    Quote Originally Posted by cazelle24 View Post
    Im not new to AR's, ive read in other posts that some barrels flex and thats normal. I came here to recieve infomation not a lecture.
    Thanks to all who wasnt a jerk.
    From your original post it makes you sound as though you are new to them. More so on the building them side. Most werent trying to be jerks as much as confused as to why you would ask this? If you werent new to them. Also as stated it is not a great idea to be configuring or building them if you dont have experience. This could be a loss of life or limb issue if done wrong or poorly.

  8. #18
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    If you can twist the barrel, you have a problem. In that case, the alignment pin slot in the upper is enlarged.

  9. #19
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    Quote Originally Posted by AKDoug View Post
    I can take the barrel and the MFR tube on my DDM4V7 and flex the two towards each other just using thumb and index finger strength. It springs right back. I have no clue if the barrel or the tube is flexing, but it's not loose.
    Yep. Barrels/receivers flex quite a bit. It might surprise you.
    "You people have too much time on your hands." - scottryan

  10. #20
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    Doesn't surprise me at all. That's why we have free float tubes.

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