Author Topic: Ar-15 issues  (Read 4596 times)

Offline KyleW

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Ar-15 issues
« on: March 09, 2012, 08:18:03 AM »
So my buddy has an Olympic arms ar-15 and every time we go shooting the entire bolt assembly seems to get stuck or sluggish after firing a round. So I broke the gun down, lubed it up and still the same issues. Any ideas? Could it be the buffer not pushing back strong enough to chamber the next round?

Offline EMC

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Re: Ar-15 issues
« Reply #1 on: March 09, 2012, 09:21:52 AM »
I'm not a Smith, but I have a suggestion for the first thing I would check:

Make sure the gas key (tube looking protrusion on the top of the bolt carrier that contacts the gas tube) on the bolt carrier hasn't come loose. This can cause gas to escape so it short strokes the gun.
« Last Edit: March 09, 2012, 12:10:12 PM by EMC »

Offline KyleW

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Ar-15 issues
« Reply #2 on: March 09, 2012, 12:42:48 PM »
Ok. Thanks. I'll take a look at that.

Offline GeorgeHill

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Re: Ar-15 issues
« Reply #3 on: March 09, 2012, 10:06:02 PM »
Take the gun to Joe, aka "Gundoc", at Crusader Weaponry.  He can make even that rifle run like Satan's Sewing Machine. 

Offline KyleW

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Ar-15 issues
« Reply #4 on: November 15, 2012, 01:14:38 AM »
So I figured out what was wrong with my buddies AR. It seemed to be getting stuck while being racked all the way back. So I broke her down and inspected closer and saw that the BCG was rubbing the walls quite badly. So long story short... After 3 hrs of sanding and polishing the BCG and inside the upper she was as good as new. Or should I say as good as broken in. I think that was the biggest issue, it not being fully broken in.

Offline OldSchool45B

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Re: Ar-15 issues
« Reply #5 on: December 27, 2012, 06:18:34 PM »
You shouldn't have to break it in like that, or do any fitting and polishing. It is out of spec some where, I am guessing in the buffer tube threading. But it is NOT right.

Offline Paladin

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Re: Ar-15 issues
« Reply #6 on: January 28, 2013, 02:56:36 PM »
I know this is an old post, so the problem sounds like it's rectified, but I'd add that common mistake folks make is putting the firing pin retaining pin in from the right to the left, instead of from left to right (like should be done). When this is done incorrectly, the head of the firing pin retaining pin will protrude slightly from the right side of the carrier and drag the inside of the upper receiver, causing sluggish operation or in come cases, the bolt carrier sticking in the upper.

PS: I was a DOD Small Arms Repairman and military firearms instructor, so I've seen this happen MANY times!
-Steve
RIP TSgt Jason Norton and SSgt Brian McElroy- KIA 22 Jan 06, near Taji, Iraq. You will never be forgotten.

Offline OldSchool45B

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Re: Ar-15 issues
« Reply #7 on: January 28, 2013, 06:33:03 PM »
PS: I was a DOD Small Arms Repairman and military firearms instructor, so I've seen this happen MANY times!

Yep. You would think that the milled little pocket on the left side of the BCG would be a clue, that the pin head goes in there. But surprisingly, sometimes it isn't.

Offline Paladin

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Re: Ar-15 issues
« Reply #8 on: January 28, 2013, 08:50:43 PM »
Yeah, the recess for the pin head needs a neon-light above it. I've seen lots of troops screw that one up...
-Steve
RIP TSgt Jason Norton and SSgt Brian McElroy- KIA 22 Jan 06, near Taji, Iraq. You will never be forgotten.

Offline OldSchool45B

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Re: Ar-15 issues
« Reply #9 on: January 28, 2013, 09:23:09 PM »
That is why they put "Front Towards Enemy" on claymores. Lowest common denominator. LOL

Offline Paladin

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Re: Ar-15 issues
« Reply #10 on: January 29, 2013, 07:46:51 AM »
I see you were a 45B. I was a Combat Arms Specialist, aka CATM (Air Force small arms repairman). I'd bet we could share some stories! I retired last spring. 20 years goes quick...
-Steve
RIP TSgt Jason Norton and SSgt Brian McElroy- KIA 22 Jan 06, near Taji, Iraq. You will never be forgotten.