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Posted: 8/14/2004 3:08:12 PM EDT
[#1]
Make sure you dont have a spent primer or some similar piece of crap floating around in your lower reciever.
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Posted: 8/14/2004 3:12:04 PM EDT
[#2]
Same thing happened to me quite a while back. As I recall, it was a firing pin that was probably in spec, but fractionally too short. DPMS replaced it for free at a gun show, with one that was very slightly longer.
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Posted: 8/14/2004 3:20:18 PM EDT
[#3]
This might be a stupid question, but does the firing pin shorten in time due to usage? |
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Posted: 8/14/2004 3:27:12 PM EDT
[#4]
It wears down. It has to, law of physics. Every part of your AR is going to wear down. I would guess the pin will shorten, not too much. |
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Posted: 8/14/2004 4:42:35 PM EDT
[#5]
First thing, with the rifle unloaded, pull back the charging handle, release it and pull the trigger. If nothing happens, pivot the upper open and see if the hammer is cocked. If not, it is following the carrier down. Possibly due to worn engagement surfaces on either the hammer, trigger or disconnector.
If the hammer is cocked, place something in front of it to protect the bolt catch then pull the trigger. If nothing happens, and the trigger won't move, disassemble the fire control parts and inspect them. Also looking for something loose underneath them, blocking the trigger movement. Possibly a spent primer or other small piece of junk. In either case, you would still have light strikes on the primer, as the inertia from the firing pin alone will slightly dent a primer. Good Luck  Lonny |
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Posted: 8/14/2004 5:57:01 PM EDT
[#6]
Ok, I did what you said and found a spent primer in there. I removed it and still nothing. The hammer is cocked but when I pull the trigger it won't budge. If I nudge the hammer a little bit I can THEN pull the trigger. What could be preventing the hammer to be released? cp |
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Posted: 8/14/2004 6:00:02 PM EDT
[#7]
Make sure you dont have ANOTHER spent primer still in there.
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Posted: 8/14/2004 6:07:50 PM EDT
[#8]
I agree with HM, check the lower, I had the same problem and I decided to take her apart and the buffer retaner spring was all discombobulated in the trigger. Joe |
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Posted: 8/14/2004 6:21:05 PM EDT
[#9]
You guys were right I found another spent primer. Would this also be the reason for the small dents in the unspent rds.
Thanks again. cp |
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Posted: 8/14/2004 6:43:07 PM EDT
[#10]
Proabally just light hits from the floating firing pin upon chambering the round. This is normal.
Now, what ammo were you using that was popping primers? |
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Posted: 8/14/2004 6:49:08 PM EDT
[#11]
Now that you've solved the problems at hand with your rifle, its time to talk about ammo. With not one but TWO loose primers floating around in there, you may need to look at switching ammo. I'm no ammo expert, but quality mil-spec ammo will have a primer that is locked in good, crimped in to be exact I think. This is to prevent what you are going through when it really matters.
So just out of curiosity, what ammo are you using? Are you using reloads? Tex78 |
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Posted: 8/14/2004 7:10:29 PM EDT
[#12]
Sounds like your rifle has excessive headspace. Mil spec ammo will hide this problem because of the cases stronger construction.
mark |
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Posted: 8/14/2004 7:22:04 PM EDT
[#13]
Its far to early to remotely diagnose a headspace problem when we don't even know what ammo he is shooting. Popped primers usually means defective ammo. |
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Posted: 8/14/2004 8:23:42 PM EDT
[#14]
I mixed up my normal stuff with some old old stuff I bought at the gun shop. I can't remember the manuf. but I remember as soon as I bought it I went out shooting and my problems began. I also used American Ammo too, but I think it was from the old stuff. I normally shoot Winchester white box and hardly ever shoot Wolf but I remember when I did shoot wolf and WWB I had no issues at all.
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Posted: 8/15/2004 7:23:40 PM EDT
[#15]
Whoa. Never had any problems like that azmotorsports.
The lower I bought from local dealer here as an assembled unit, so it should have Bushie parts in it. The upper assembly is using a Colt (as far as I can tell, says C MP on it) bolt with an RRA carrier and reciever. When I first got the upper, I had a few FTE's which was a result of brass shavings working their way into the ejector housing. The dealer I bought it from (from here BTW) replaced the bolt and that solved the FTE's. This was a long time ago and probably doesn't have any cause in this, but just in case. If you can't get it to work, let me know. |
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Posted: 8/15/2004 7:50:32 PM EDT
[#16]
I had a simalar problem with a a1 rifle I had built using used gun show parts, after I had fired several hundred rds. through it, it started popping two or so primers out of every mag. so I replaced the firing pin still no fix so I took it a friend who has alot of expirience with ars, he measured the fireing pin hole in the bolt and it was way out of spec. and was allowing the primers to flow back around the pin and rupture, he filled the hole with some alloy redrilled the hole to spec. and I never had another pireced primer, another fix would've been to get a new bolt but I'd like I said it was a cheap throw together.
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Posted: 8/15/2004 9:12:36 PM EDT
[#17]
Thanks AZ-K9 I'll take it out this week to the range and see if it works. I really think it was a case of old bad ammo and the primer stuck under the safety assembly. Thanks for all of your help guys. cp |
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Posted: 8/20/2004 1:14:46 PM EDT
[#18]
Just got back from the range and guess what... the same problem persisted after about 50rds. I didn't get a chance to look inside yet, but will tonight.
Here's what happened. After the fourth mag, I put a new one in and released the bolt. At that point I tried to squeeze the trigger and it felt like the safety was on. I tried to switch it to safety but that didn't move either. So I removed the mag and emptied the chamber. Pulled the charging handle back, tried to dry fire it and the trigger wouldn't budge. Wiggled the stuck safety switch back and fourth about 1/4 of the regular normal movement which finally moved all the way and I was able to dry fire. Tried it again and the trigger wouldn't budge again. Back to the beginning. Please help, I would hate to pay the hefty price tag at the gunsmith for something simple I can fix. Thanks. cp |
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Posted: 8/20/2004 1:39:39 PM EDT
[#19]
Are you still using American ammo? That stuff is TOTAL CRAP! I bet it shed some more primers into your lower.
-Troy |
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Posted: 8/20/2004 2:04:19 PM EDT
[#20]
I should of checked the spent brass. Dang it!!!
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Posted: 8/20/2004 6:01:09 PM EDT
[#21]
Check the spent brass and tell us the headstamp.
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Posted: 8/20/2004 6:13:05 PM EDT
[#22]
i have walmart 223 55gr... 40round boxes for $7.50 the best deal around here for good ammo... its about the same price as xm193 but its local and by the box full... not by the case
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Posted: 8/20/2004 6:16:50 PM EDT
[#23]
Yes yes yes yes yes Enquiring minds want to know!      
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Posted: 8/21/2004 12:11:15 AM EDT
[#24]
It was American Ammunition (red & blue box of 50). The gun shop said it was made in Isreal or something. I found another primer waaayyy under the trigger group. It was a pain getting it out, but it seems to be working now. I'll take her out Monday to find out. Has anyone else had this happen with ammo? |
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Posted: 8/21/2004 12:38:14 AM EDT
[#25]
That ammo has a worse ( and most deserved) rep than Wolf . |
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Posted: 8/21/2004 1:39:29 AM EDT
[#26]
Told ya.
Yeah. It most commonly happens with Federal (anything but XM193, which is really Lake City, not Federal). Fed AE sheds primers a lot, due to their bad brass. But American Ammo has the worst reputation in all of ammo-land, and that's been true for at least the last 8 years. I strongly recommend not buying anymore. -Troy |
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Posted: 8/21/2004 9:36:13 AM EDT
[#27]
Another: "Told ya!" here!
Occams razor man, Occams razor. Stop using crap ammo and the primer problem will magically dissappear! |
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Posted: 8/23/2004 12:50:00 PM EDT
[#28]
Ho do you guys like the Winchester white box stuff?
cp |
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Posted: 8/23/2004 5:43:01 PM EDT
[#29]
Ive shot a couple of hundred Whinny white box and have had NO problems. I normally shoot Q3131A whinchester . Been about $160 for a 1000 rd. case. Good luck WarDawg
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Posted: 8/26/2004 6:05:46 PM EDT
[#30]
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Posted: 8/26/2004 9:27:57 PM EDT
[#31]
AZmotorsports(insert your name here) :).....what part of the valley are you..??
Brad |
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Posted: 8/27/2004 12:40:26 AM EDT
[#32]
make sure you dont have a reduced weight hammer spring. My AR sometimes fail to fire military primers.
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Posted: 8/27/2004 1:22:08 AM EDT
[#33]
Epic, ROTFLMAO!!!!!! |
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Posted: 8/27/2004 5:50:25 AM EDT
[#34]
Jeezus, throw that sh*t ammo away. You're going to ruin your gun.
KAC |
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Posted: 8/27/2004 8:39:38 AM EDT
[#35]
I shot some 'Olympic' ammo I got from J&G, and it did the same thing. Good ammo should fix you right up.
~Doug |
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Posted: 9/3/2004 9:48:15 AM EDT
[#36]
150 rds at the range with winchester white box and NO problems at all. Thanks guys.
cp |
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Posted: 9/3/2004 10:02:41 AM EDT
[#37]
I've ONLY used the Winchester White box Q3131A ammo in my AR's and have NEVER popped a primer. I got mine for about the same price of $167/1000 round case at a local gunshow.
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