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Thread: How many rounds before you consider an AR "good to go"?

  1. #21
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    Well may last "frankengun" utilized a BCM upper (complete, had the gas block pinned by Adco), DD chromed BCG (bought straight from DD), Geissele SD-C trigger, Knight's stripped lower, and blue Sprinco spring with H2 buffer. It is possible to build a quality "frankengun".
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  2. #22
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    The latest two ARs I've been putting rounds through are an A1 rifle clone and a GUU-5/P clone. Both of them have BCM BCGs and gas tubes, and the GUU-5/P also has a 14.5" BCM barrel, H-buffer and buffer spring, and a Colt receiver extension. Again, not stuff that's first in the rotation for HD but I like to have some assurance it's in working order. Going forward I may shift toward higher round count range sessions.
    Since yes, any round could be the one that fails, and ammo and mags can be variables, I think the biggest reason I like to put at least 500 rounds is to see if any mechanical problems with the gun itself crops up, which would likely mean I screwed something up during assembly. If no sign of inherent problems with what I built manifest, I feel a lot better about it.
    BCM is my first stop generally when "building" an AR, but since they don't make stuff like A1 uppers and lowers, or 20" pencil barrels, I had to branch out at bit for the two recent builds in question.
    Last edited by Circle_10; 03-06-18 at 07:30.

  3. #23
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    Every one of my new ARs that had problems, had problems from the start. Whether it was out of spec feed ramps, extractor springs, over sized gas ports, needed the preservative cleaned out, etc.

    Do a thorough inspection, a few function checks, lock back checks, pay attention to how the recoil feels, run a few FULLY LOADED mags through it and get down to shooting.
    INSIDE PLAN OF BOX
    1. ROAD-RUNNER LIFTS GLASS OF WATER- PULLING UP MATCH
    2. MATCH SCRATCHES ON MATCH-BOX
    3. MATCH LIGHTS FUSE TO TNT
    4. BOOM!
    5. HA-HA!!

    -WILE E. COYOTE, AUTHOR OF "EVERYTHING I NEEDED TO KNOW IN LIFE, I LEARNED FROM GOLDBERG & MURPHY"

    http://i115.photobucket.com/albums/n289/SgtSongDog/AR%20Carbine/DSC_0114.jpg
    I am American

  4. #24
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    Quote Originally Posted by MistWolf View Post
    Every one of my new ARs that had problems, had problems from the start. Whether it was out of spec feed ramps, extractor springs, over sized gas ports, needed the preservative cleaned out, etc.

    Do a thorough inspection, a few function checks, lock back checks, pay attention to how the recoil feels, run a few FULLY LOADED mags through it and get down to shooting.

    Would you share which makes and models gave you problems?
    Train 2 Win

  5. #25
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    [QUOTE!=ABNAK;2605792]Well may last "frankengun" utilized a BCM upper (complete, had the gas block pinned by Adco), DD chromed BCG (bought straight from DD), Geissele SD-C trigger, Knight's stripped lower, and blue Sprinco spring with H2 buffer. It is possible to build a quality "frankengun".[/QUOTE]

    I was thinking about my Frankeguns with Vltor MUR-1A uppers, Centurion Arms or Daniel Defense barrels, LMT enhanced carriers and I’m not feeling inferior at all. In fact I’d say quite the opposite.


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  6. #26
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    On a gun I've put together, using parts of known quality- I have no problem carrying the gun after dial in and a couple mags of ammo with flawless function.

  7. #27
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    Quote Originally Posted by T2C View Post
    Would you share which makes and models gave you problems?
    PSA 16" Kit- Out of spec feed ramps (fixed under warranty), weak extractor spring, came with carbine weight buffer.

    Homebuild with STS lower- 10.5" Odin Works barrel over gassed, gas port location a bit off, weak extractor spring (generic BCG), bolt release cut on lower out of spec, take down pins fit loose.

    Colt Carbine- Factory preservative when combined with Froglube affected function.

    Colt Shortie- Factory preservative when combined with Froglube affected function.

    Walther PPQ- One factory magazine occasionally staggers the ammo wrong.

    Colt 1911- Slow lock time due to factory preservative combined with Froglube. Note: Same thing occurred with another Colt 1911 I owned since the 90s. There were traces of the factory preservative still on the mainspring. When I lubed it with Froglube, the preservative & Froglube combined and turned thick and gummy.

    Ruger Bearcat- Locked up when cocking. Transfer bar spring missing from factory.

    Marlin Model 39- Out of spec extractor.

    Off brand (forget which) cheapie AR a friend bought- Weak extractor spring, weak action spring, over gassed, came with carbine weight buffer.

    New homebuilt AR carbine a guy brought to the range to test fire- Weak hammer spring.

    New homebuilt AK a guy brought to the range to test fire- Bullet strikes due to crooked muzzle device.

    Dad's Rossi 10 shot DA revolver- Excessively heavy trigger pull. I mean over 20 lbs heavy. Did not break down pistol to find out why.

    All the above problems I personally experienced and identified and all showed up right away. The weak extractors sometimes take a few more rounds because they cause intermittent problems that a shooter can easily misdiagnose. I included firearms other than ARs to show that it can be a universal problem. If a firearm has a flaw, it will usually show up in in less than 100 rounds. If it has a hidden catastrophic flaw, like poor heat treat or prone to cracking, that won't show up until it shows up, no matter how many test shots are fired. A friend had one of those Keltec folding carbines in 5.56. Somewhere between 1000 and 1500 rounds, it broke in half at the back end of the receiver and Keltech replaced the whole rifle. Any firearm that doesn't have problems right away won't start having problems until something wears out or breaks.
    Last edited by MistWolf; 03-06-18 at 12:48.
    INSIDE PLAN OF BOX
    1. ROAD-RUNNER LIFTS GLASS OF WATER- PULLING UP MATCH
    2. MATCH SCRATCHES ON MATCH-BOX
    3. MATCH LIGHTS FUSE TO TNT
    4. BOOM!
    5. HA-HA!!

    -WILE E. COYOTE, AUTHOR OF "EVERYTHING I NEEDED TO KNOW IN LIFE, I LEARNED FROM GOLDBERG & MURPHY"

    http://i115.photobucket.com/albums/n289/SgtSongDog/AR%20Carbine/DSC_0114.jpg
    I am American

  8. #28
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    Quote Originally Posted by gaijin View Post
    On a gun I've put together, using parts of known quality- I have no problem carrying the gun after dial in and a couple mags of ammo with flawless function.
    This. If I trust the manufacturer and I trust the ammo, a 300 round day of sighting in and playing around at the range is all i need to know. I'll usually run 3 or 4 types of ammo that I keep on hand and buffers carbine through H3 and if everything is good to go, I'll use whichever ejects rounds to my liking (usually the heaviest it will run with .223 spec ammo) and never think about it again. I have never encountered any issues with this method.
    "The machine doesn't make the man, the man makes the machine" - Gucci

  9. #29
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    Quote Originally Posted by midSCarolina View Post
    This. If I trust the manufacturer and I trust the ammo, a 300 round day of sighting in and playing around at the range is all i need to know. I'll usually run 3 or 4 types of ammo that I keep on hand and buffers carbine through H3 and if everything is good to go, I'll use whichever ejects rounds to my liking (usually the heaviest it will run with .223 spec ammo) and never think about it again. I have never encountered any issues with this method.
    I’m with you guys on this. I think there are diminishing returns where you are going to see wear before finding failure.

  10. #30
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    I have Several BCM rifles that I have put together with BCM uppers and lowers, never a problem.
    I have an AR with a BCM upper and a Spikes lower I bought on the board. It had very minor hick-ups so I changed out springs, cleaned up the chamber and put in a quality trigger, again no more issues.
    I have an AR pistol with a BCM upper and and Aero Precision lower, again never a problem.
    During assembly I usually take my time and CQ parts as they go in, QC is a big part of my job so I am very thorough.
    I have scrapped lowers at the first sign of them being out of spec as far as dimensions.
    I think a big part of reliability comes with attention to details. I would guess within 300 rounds I know if the gun is reliable or not.

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