Bsbllrooster Posted October 16, 2017 Share Posted October 16, 2017 I have a gii hunter that I use for PRS stuff as well as my hunting rifle. I have a hunt coming up first weekend of November so I went out to confirm my zero and some offhand shooting practice. That’s when I started having some issues. The first signs of any issues is I was starting to get light primer strikes and when attempting to eject the unfired round I had to slam the buttstock on the ground while holding the charging handle. I then proceeded to try and take down the rifle to see what was going on but since it is difficult to do the above mentioned maneuver while you have the gun split it took some serious effort to get the bcg out of the upper. Once I had the BCG out, I pulled the firing pin retaining pin but the firing pin wouldn’t come out. Had to pull it out with pliers. Once out a bunch of metal debris came out with it and the tip of the firing pin looks pretty mangled. I then pulled the bolt out of the BCG and found some more metal debris in the firing pin channel. I cleaned everything real well and tried to insert the BCG minus the FP back in the gun but it still gets hung up when it gets into battery. I tried the bolt carrier alone without the bolt and it seems to go in fine. When I put the bolt into the BCG without the cam pin it seems to go in and out of battery just fine as well. When I put the bolt and cam pin but no firing pin back into the BCG it gets jammed up. Anyone have any thoughts. I checked the chamber and barrel extension for debris but can’t find any and there doesn’t seem to be any abnormal wear on the bolt or lugs. Anyone have any thoughts on what’s up. I need to get this rifle back up and running before my hunt. Thanks in advance guys. Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
1chota Posted October 16, 2017 Share Posted October 16, 2017 remove the bolt and look into the cavity where the bolt rides. I had a 308 that got sticky like that and had beau coup carbon build up in there. cam pin was nasty too. I don't know about the mangled FP and metal shavings. for sure new FP. lots of lube. Link to comment Share on other sites More sharing options...
Bsbllrooster Posted October 17, 2017 Author Share Posted October 17, 2017 I’ve pulled the entire BCG apart and everything is really clean. The bolt moves within the carrier without issue but it still hangs up in the chamber with the cam pin installed. Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
Darqusoull13 Posted October 17, 2017 Share Posted October 17, 2017 Are the "metal shavings" pieces or primer you're blowing out? What do your fired primers look like? What is your load and velocity? Link to comment Share on other sites More sharing options...
Bsbllrooster Posted October 17, 2017 Author Share Posted October 17, 2017 Primers all seem to be ok. I shoot 168 gr FGMM and 180 gr federal premium ballistic tip ammo. No reloads through the rifle yet. Probably only has about 400-500 rounds through it. The metal debris definitely doesn’t look like pieces of primer. It almost looks like really course metal blasting media. Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
DesertTortoise Posted October 17, 2017 Share Posted October 17, 2017 Does the bolt rotate freely through its normal range of rotation by hand (out of the gun) with the cam pin in place? Link to comment Share on other sites More sharing options...
Bsbllrooster Posted October 17, 2017 Author Share Posted October 17, 2017 Yes the bolt moves normally within the carrier with the cam pin installed as far as I can tell. Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
DesertTortoise Posted October 17, 2017 Share Posted October 17, 2017 Maybe pull the extractors off and look inside the bolt itself. Link to comment Share on other sites More sharing options...
ShootfastRunfaster Posted October 17, 2017 Share Posted October 17, 2017 2 hours ago, Bsbllrooster said: Primers all seem to be ok. I shoot 168 gr FGMM and 180 gr federal premium ballistic tip ammo. No reloads through the rifle yet. Probably only has about 400-500 rounds through it. The metal debris definitely doesn’t look like pieces of primer. It almost looks like really course metal blasting media. Sent from my iPhone using Tapatalk I can see from your pictures that you definitely have a firing pin issue. The particles in the picture of the metal pieces look like pieces of primer anvil and cup. Without closer inspection I can only suggest a couple of causes. One is that the tip fractured and enough remained to allow for primer ignition. Since the tip was jagged and did not fully come into contact with the cup, the resulting pressure inside the case blew the primer parts through the firing pin hole in the bolt face and into the channel. You need to inspect your fired cases to see if ther spent primers are intact. Number two is that you had an existing chamber pressure problem or a long nosed firing pin that was causing pierced primers Eventually the pierced primers let enough gas through and it cut the firing pin tip down along with the opening in the bolt face allowing for the primer debris to get past. Get hold of a replacement firing pin and make sure that the bolt face has not been burned through. When checking to see if the bcg moves freely in the upper, you need to have the fp installed. If you install the cam pin and do not have the fp installed, it can rotate and hang up in the upper. The cam pin must be aligned properly so the corners will clear when the bcg moves beyond the cam pin relief area in the upper receiver. These are only 2 possibilities. I hope this helps. Kuan Link to comment Share on other sites More sharing options...
Bsbllrooster Posted October 20, 2017 Author Share Posted October 20, 2017 DPMS customer service wants the whole rifle sent in. Wouldn’t just send new parts. I will report back what they find. Thanks for the recommendations guys. Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
Darqusoull13 Posted October 20, 2017 Share Posted October 20, 2017 Agreed with Kuan, that definitely looks like pieces of primer. Your firing pin definitely borked although whether that is a cause or a result of the issue is hard to tell. Federal GMM is not loaded close to what you'd need to do that to a primer. Did you save your brass so you can post pictures of the fired primers and can you post pictures? Link to comment Share on other sites More sharing options...
Bsbllrooster Posted October 23, 2017 Author Share Posted October 23, 2017 Looking at my brass I would say about 70% are fine and about 30% have cratered primers. Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
wgj3 Posted October 23, 2017 Share Posted October 23, 2017 1 hour ago, Bsbllrooster said: Looking at my brass I would say about 70% are fine and about 30% have cratered primers. Sent from my iPhone using Tapatalk "Cratered" or pierced... The concern that most are expressing is that you have primers that are being punctured/pierced by funky firing pin and/or pressure... That would explain the bits of material you've found. Link to comment Share on other sites More sharing options...
Bsbllrooster Posted October 23, 2017 Author Share Posted October 23, 2017 I didn’t find any pierced primers. Just cratered ones. Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
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