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Thread: Name off all the checks a new AR should get..

  1. #11
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    Make sure nothing is in the bore. I've seen everything from powder residue to little shards of cardboard (no kidding!).

    I also check to make sure the bolt carrier key and receiver extension castle nut are properly staked. I did have a receiver extension come loose from improper staking and/or tightening on a first range trip.

    I recommend checking the part of the gas tube that comes into the receiver. One brand new AR I purchased twenty years ago or so had some grease or something inside the tube as it came from the factory. I'm not sure if the first round fired would have melted that grease and I would never have noticed it, but I cleaned it out with a pipe cleaner anyway.

  2. #12
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    Quote Originally Posted by MistWolf View Post
    1) Disassemble and remove all factory preservative
    2) Lube
    3) Perform lock back check
    4) Insert fully loaded magazine and begin shooting
    I do this with every gun I get, I'm always surprised on how many little shards of metal I find.

  3. #13
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    Definitely should test the FCG as mentioned above, but I’d do it with the upper removed.

    With the safety on fire, cock hammer, pull trigger, (catch the hammer so it doesn’t slam into the receiver. Keeping the trigger pulled, manually pull the hammer back until caught by the disconnector. Slowly release the trigger. The hammer should slide out from under the disconnector’s hook and be caught by the sear. If the timing is off, the sear won’t catch and it’ll fire on trigger release. Last AR I bought (as a complete rifle for around $1k) had this defect. This is not a pleasant defect to discover at the range when test firing.

    While doing this, obviously also make sure the safety “works” as intended.

  4. #14
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    Quote Originally Posted by 26 Inf View Post
    Do steps 11 and 12 accurately depict what you refer to as a lock back check function check?
    Yes. But you forgot Step 13
    13) Load one round in mag. Insert mag in magwell, load rifle and fire. Carrier should lock back.

    Step 14 would be to insert a fully loaded magazine and test fire for function until the mag is empty and locks back. All rifles should test fired with a fully loaded magazine before being put to use.
    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

  5. #15
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    Quote Originally Posted by MistWolf View Post
    Yes. But you forgot Step 13
    13) Load one round in mag. Insert mag in magwell, load rifle and fire. Carrier should lock back.

    Step 14 would be to insert a fully loaded magazine and test fire for function until the mag is empty and locks back. All rifles should test fired with a fully loaded magazine before being put to use.
    FYI, if you immediately do a "load 1 round and in magazine, fire then check for lock back" as the first round fired, many people will think their brand new AR is broken. Your brand new AR may only start to lock back after the last round until after a few mags.

    Reason is that a brand new AR is virgin tight. The parts need time to wear on each other and it doesnt help that both phosphate and anodizing are very rough finishes.
    Last edited by vicious_cb; 03-26-18 at 19:38.

  6. #16
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    In fact, I had that very problem with a new 6933 but it didn't take long for it to settle in. Still, the lock back check makes a good starting point.
    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

  7. #17
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    Quote Originally Posted by MistWolf View Post
    Yes. But you forgot Step 13
    13) Load one round in mag. Insert mag in magwell, load rifle and fire. Carrier should lock back.

    Step 14 would be to insert a fully loaded magazine and test fire for function until the mag is empty and locks back. All rifles should test fired with a fully loaded magazine before being put to use.
    That would be ideal, but hard on the range house/armory.

  8. #18
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    You might want to observe the processes of extraction and ejection by allowing someone else to fire it as you stand behind them and observe.

  9. #19
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    Basic stuff should be done before range (headspace, lock back, safety manipulation, muzzle device tension, gas block screws). At the range I mag dump with m193. Mag dump with shit steel or anemic 223 (PMC Bronze). Watch ejection, feel consistency of recoil. Accuracy test with something good like CBC 5.56 77gr, Geco 223, IMI 69gr, or AE 50gr varmint. Sometimes I do a stringing test with a 5 shot group, a mag dump, and a 5 shot group.

  10. #20
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    Quote Originally Posted by MistWolf View Post
    1) Disassemble and remove all factory preservative
    2) Lube
    3) Perform lock back check
    4) Insert fully loaded magazine and begin shooting
    Whats the best option to remove factory preservatives? Probably in my best interest to get a cleaning kit, any recommendations?

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