Page 1 of 3 123 LastLast
Results 1 to 10 of 23

Thread: Police Trade In LWT Govt Carbine Hammer Pin Hole

  1. #1
    Join Date
    Feb 2012
    Location
    Victoria, TX
    Posts
    519
    Feedback Score
    42 (100%)

    Police Trade In LWT Govt Carbine Hammer Pin Hole

    Greetings All,

    Longtime lurker and I did attempt several searches with no related posts found.

    I bought a 10 year old patrol rifle from my dept.

    bone stock Colt A2 Govt Carbine pencil barrel 16" with a sporter bolt (thats how they came in 2003) small .155 pins.

    Trigger press is standard Colt (nothing fancy...duty trigger with long creep)

    If I had to guess, around 10,000+ rounds fired through this gun but countless dry fires added. (the dept would buy alot of steel case Wolf back then). never a single issue with this rifle.

    The rifle function checks properly but I noticed the hammer pin moves slight forward. The hammer pin holes have a very slight egg shape.

    Years ago I purchased some KNS anti rotate pins (FAD) but never installed (still NIB)

    I decided to install them on this Colt to minimize any additional wear on the hammer pin holes.

    After install, the BCG locked up 3/4s back and would not go forward into battery. I pulled back on the charging handle to release any pressure and pressed the trigger. Felt a clunk and the BCG went into battery when I released the CH.

    I pressed the trigger and the hammer fell but I saw the KNS outer arms move slightly forward.

    I reset the trigger (while still holding the trigger to the rear) and as soon as I started to release the trigger, the hammer fell and the KNS outer arm moved fwd.

    I reinstalled the factory trigger pins and the function returned.

    This rifle was bought as a gift for my child to learn to shoot a standard AR platform.

    If my lower receiver hammer pin holes are likely the culprit, is there a quality business that will bushing the pin holes or perhaps drill to the larger Colt hammer pin (.170)?

    any other advice or direction would be greatly appreciated.

    thanks in advance

  2. #2
    Join Date
    Mar 2012
    Location
    whoring myself to an NFA examiner
    Posts
    859
    Feedback Score
    8 (100%)
    Have you inspected the J spring for breakage or wear? After a metric butt ton of rounds it could be worn out or on the way out and letting the pin walk.

    If indeed you needed some kind of machine work on a Colt I'd contact Specialized Armament.
    Last edited by Split66; 05-25-13 at 20:58.
    http://t0.gstatic.com/images?q=tbn:ANd9GcRQ2zEv1ukzyH_aeFG6-amwPk7CUBz7b4URcTQ8lFFl-LOLSDkQ

    "BRD, much like the Wutang clan, is nothing to f@ck with"

  3. #3
    Join Date
    Jul 2006
    Location
    Oregon
    Posts
    3,459
    Feedback Score
    2 (100%)
    Please get an armorer with the correct tool to measure the holes before you do anything crazy.

  4. #4
    Join Date
    Jan 2008
    Location
    AZ-Waging jihad against crappy AR's.
    Posts
    24,902
    Feedback Score
    104 (100%)
    The No Go plug gage used by the military is .163 inches. It is not a standard gage, in that the ends of it have slight angles. The gage is used to check all 4 sides.

    Can you take pics of the holes? I have seen military weapons with more time than what is on your lower that were fine. The usual culprit is disassembly without the proper tools and techniques.

    I would get a new fire control group first and then see what happens.



    Owner/Instructor at Semper Paratus Arms

    Facebook: https://www.facebook.com/SemperParatusArms/

    Semper Paratus Arms AR15 Armorer Course http://www.semperparatusarms.com/cou...-registration/

    M4C Misc. Training and Course Announcements- http://www.m4carbine.net/forumdisplay.php?f=141

    Master Armorer/R&D at SIONICS Weapon Systems- http://sionicsweaponsystems.com

  5. #5
    Join Date
    Feb 2012
    Location
    Victoria, TX
    Posts
    519
    Feedback Score
    42 (100%)
    I am actually the main person who maintained these guns for the life of the PD. I have been to two Colt and one other armorers class.

    This gun would have been maintenance once a year. We do have other supplemental armorers who report to me but I cannot do it by myself since I have other main duties and rely on them to do it correctly.

    Originally, this was my gun and it probably got shot around 5000 rounds. when I left the streets in 2006, it was a general use gun and then it went to School Resource Officers in 2008. my best guess was around 10,000 - 15,000 rounds fired.

    I always taught officers to lubricate the fire control areas.

    Now that does not mean officers did not monkey with this rifle and took areas apart and might have not known the proper procedures for disassembly and reassembly.

    Since the gun cosmetically was rough, I did put a light coat of black camo with some red lettering (it was muted out) and then some matte clear. When I bought it and brought it home, I did a complete break down for cleaning and removing of oil for the painting procedure. that is when I noticed the hammer pin hole seemed a tad worn or appeared slightly out of round.

    Since this gun was out of my control for several years....anything could have happened.

    I do have two personal duty BCMs Mid LWTs that I installed ALG triggers so I have two low mileage BCM trigger/hammer groups.

    Correct me if I am wrong, if you have a well used trigger/hammer controlled group to include receiver trigger/hammer pin holes, shouldn't the KNS concept of tightening the tolerances improve trigger/hammer function, not the other way around where I lose complete function and safety?

    thanks in advance

    Attachment 16819

    Attachment 16820

  6. #6
    Join Date
    Jul 2007
    Location
    New Jersey
    Posts
    7,152
    Feedback Score
    4 (100%)
    Maybe it's glare or lube but I'm not seeing that the hole is the problem.

  7. #7
    Join Date
    Feb 2012
    Location
    Victoria, TX
    Posts
    519
    Feedback Score
    42 (100%)
    I see slight metal push at 3 o'clock on the hammer pin hole.

    Attachment 16822
    Last edited by SW CQB 45; 05-26-13 at 11:41.

  8. #8
    Join Date
    Jul 2007
    Location
    New Jersey
    Posts
    7,152
    Feedback Score
    4 (100%)
    Quote Originally Posted by SW CQB 45 View Post
    I see slight metal push at 3 o'clock on the hammer pin hole.

    Attachment 16822

    That helped, can see what you mean now. I'd still say it's too slight to have an impact but since there was a problem using the KNS pins it's hard to dismiss outright. While I can't solve this for you I am very interested to see what turns out to be the problem. Stay patient with the thread and someone will come along with the magic suggestion.

  9. #9
    Join Date
    Jun 2009
    Location
    Allentown, PA
    Posts
    3,389
    Feedback Score
    58 (100%)
    I agree wit Safetyhit on this issue. I will also add that 1.) there is always movement in the hammer pin during firing. 2.) KNS pins can induce more problems than they are worth. Try your BCM FCG and that should solve the issue.
    "Perfect Practice Makes Perfect"
    "There are 550 million firearms on this planet. That's one firearm for every 12 people. The question is... How do we arm the other 11?" Lord of War.
    "I predict future happiness for Americans if they can prevent the government from wasting the labors of the people under the pretense of taking care of them." Thomas Jefferson

  10. #10
    Join Date
    Feb 2012
    Location
    Victoria, TX
    Posts
    519
    Feedback Score
    42 (100%)
    Guys, thanks for your help

    You can disregard my post.

    I am a dumb azz.

    Apparently I have a big pin Colt.

    I brought out my reloading calipers and started measuring and my frame holes were measuring big at .170".

    I thought this Colt was .155 pins.

    I confirmed with the bag on my KNS kit....it was for a small pin.

    my bad.

    while I do have some metal push forward, the KNS issue is not an issue as they are not the correct size for my Colt.

    the metal push measured is approx .001" difference from 12-6 o'clock measurement compared to 9-3 o'clock measurement.

    Sorry, I dont think there is an issue with this gun.

    the issue was I installed the KNS kit and me thinking I had a small pin Colt. The KNS kit will likely be sold.
    Last edited by SW CQB 45; 05-26-13 at 12:26.

Page 1 of 3 123 LastLast

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •