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Thread: Oil in the chamber area?

  1. #1
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    Oil in the chamber area?

    Hello, new member here. Glad to be a new owner of an AR-15 rifle. I recently picked up a Smith & Wesson M&P 15TS.



    The only additions I have made to it are a BCM Gunfighter CH and a Magpul MOE VFG.

    I am a bit of a tinkerer (is that even a word?) and after alot of research I have gotten to know the mechanical in's and out's of the rifle quite well. But here is a noob question I have. Is it bad to get oil into the chamber/barrel extension area? I have lubed the bolt properly but I am concerned about oil that finds it way into the barrel extension area.

    I have already put 1000 rounds of various ammo thru the gun and it is now a primary HD gun. I keep it at my bedside, propped up (barrel down) between my headboard and nightstand. And being it sits there for an extended period of time, gravity draws oil into the chamber area. I do not excessively lube the bolt or BCG, but a do see a decent amount of oil seep into the lugs and extension area. I am using Breakfree CLP as my primary lube. I also have Rem-oil as a backup lube.

    So is this a bad situation for oil to collect in the extension area or not? Sorry if this is a noob question, but any help would be much appreciated.

    Thanks...

    The Guinea
    Proud Father of a United States Marine!

  2. #2
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    It's of no concern. You'd have the have the gun suspended in a lube bath to do it or you any harm, if your concern is oil compressing in the chamber and causing a KABOOM. I think you're more likely to get kicked by a mule than, under the circumstances you describe, you are to have enough oil collect to ever be a problem.

    If runoff of oil in a weapon that spends more time stored than it does being shot, use grease in stead of oil. It stays in place instead of running off. My preference is TW-25, for no better reason than I know it works great on crew-served weapons and miniguns. There's tons of other good choices out there.

    Hit the Search feature for "lube" or "grease," and synonyms and variations thereof, you'll find tons of threads, ad nauseum, ad infinitum, about lubrication practices under all sorts of circumstances.

    That poor dead horse could use a break.
    Contractor scum, AAV

  3. #3
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    I would not worry about oil in the barrel extension, as long that it is not on the bolt face or in the chamber itself. I would personally try to limit the amount of oil in the receiver extension to just a film and keep the rifle propped up on its butt to reduce the chance of any oil getting into the chamber and barrel.

  4. #4
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    Guinea are you asking this with worries about the excess lube causing excessive fouling and reducing reliability?
    "First gett'n shot, then gett'n married... baaaad habits"

    "If you're gonna subscribe to hero worship, at least worship a real hero."
    M4Guru

    Gal 2:20

  5. #5
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    Quote Originally Posted by M4Fundi View Post
    Guinea are you asking this with worries about the excess lube causing excessive fouling and reducing reliability?
    No sir. I was concerned about something similar to what forum member JSantoro mentioned. That being "oil compressing in the chamber and causing a KABOOM". Seems that is not really an issue. As I stated earlier, I have not over lubed to bolt or BCG, but have noticed some oil inside the the barrel extension area due to gravity. Maybe it would be wise to keep the gun at my bedside in another manor instead of propped up barrel side down. It's just that barrel down makes it quicker to grab if needed.

    Thanks for your replys gentlemen. I appreciate it.

    The Guinea
    Proud Father of a United States Marine!

  6. #6
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    Sorry, slight mis-type on my part.

    Oil, like water, doesn't effectively compress, hence the reasons such things can cause KABOOMs in the first place, but that presupposes something like the barrel being full of the stuff.

    Since we're not talking immersion, here, it's far more likely that my dreams of dating Isla Fisher will come to fruition than oil in the chamber causing any problems.
    Last edited by JSantoro; 10-24-10 at 21:10.
    Contractor scum, AAV

  7. #7
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    Lube on the bolt lugs and in the locking recesses is OK, even recommended. Just keep the bolt face dry except for a drop of oil on the ejector pin. If your chamber is oily after a long storage, you can always pull a bore snake before shooting to ensure there's no goop in the way.

  8. #8
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    As stated, unless you have plugged the bore, you may get a tad more smoke on the first round or two fired, no worries.
    GET IN YOUR BUBBLE!

  9. #9
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    What condition do you keep the chamber, loaded or unloaded. I would worry more about excess penetrating oil deactivating the primer of a loaded cartridge, over a period of time, then I would a kaboom. This is due to the muzzle down position.

    On duty handguns I apply oil to the breach face, firing pin, etc, then wipe it back off leaving a slight residue.

  10. #10
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    This is drawing from my USAF training with M16/M4's not something I practice on my personal weapons, but...

    Lubrication (CLP) is to be used sparingly in selected locations only and you should not be accumulating any appreciable amounts of oil. It's never explained during our training sessions (as I'm sure the trainers don't know themselves as they're often reading straight out of the AFI), but my conclusion would be the more oil present the more likely it is to gum the works up by attracting dirt and carbon.

    Having said that...if it's not a fighting gun go at it with what works best for you.
    "Come on you sons of bitches! Do you want to live forever?" Gunnery Sergeant Dan Daly

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