robertg5322 Posted January 8, 2017 Share Posted January 8, 2017 4 hours ago, usmc1974 said: Mine lasted 7 rounds they are going to send me a new pin and spring, but are out of them now and don't know when they will be getting some back in stock. Does your pin look like this? they wanted pictures so I sent some. Just like that. Heard the little nub fly across the garage and hit something. Link to comment
wolffy1876 Posted January 8, 2017 Share Posted January 8, 2017 I have over 1000 rounds on mine. So far so good. Couple of buddies who bought from same batch I did have already replaced theirs. Did I just get lucky or am I on borrowed time? Time will tell I guess. But I think I may order some spares. You know, just in case. Link to comment
usmc1974 Posted January 8, 2017 Share Posted January 8, 2017 (edited) Thinking, if I put the replacement in it will probably do the same thing. So I took .25 off the side that goes against the front of the bolt and took the shaft down so the spring glides free then cut 2 coils off the spring.. It will now launch a bic pin out of the end of the barrel. Yea, yea I know it is not very scientific but it also pops cci primers every time. Edited January 8, 2017 by usmc1974 Link to comment
Frank34 Posted January 8, 2017 Share Posted January 8, 2017 I'll bet that will work. Here is a picture of the replacement firing pin. The spring is much stronger than the one that came with the black firing pin. Link to comment
usmc1974 Posted January 8, 2017 Share Posted January 8, 2017 (edited) 12 minutes ago, Frank34 said: The spring is much stronger than the one that came with the black firing pin. Do you want the spring,stronger? The end of the replacement looks a little beefier. Edited January 8, 2017 by usmc1974 Link to comment
4T2 Posted January 9, 2017 Share Posted January 9, 2017 They got back to me right away and said they'd send out a replacement as soon as they had them back in stock. Mine is the blued one as well just like the picture posted by usmc1974 Link to comment
Frank34 Posted January 9, 2017 Share Posted January 9, 2017 I think there is a point where the spring could be too weak or too strong. I think the one that came with the black pin was too weak or maybe too short. I threw all my black firing pins and springs out so I don't have one to measure. Link to comment
TXMXRACER Posted January 10, 2017 Share Posted January 10, 2017 I have not had a problem with mine so far but looks like I need a spare just in case. Brownells is out of the colt firing pins--where is the best place to pick up a few spares? shane Link to comment
Flatland Shooter Posted January 11, 2017 Share Posted January 11, 2017 9 hours ago, TXMXRACER said: I have not had a problem with mine so far but looks like I need a spare just in case. Brownells is out of the colt firing pins--where is the best place to pick up a few spares? I have both a Colt 6951 firing pin and extractor on back-order at Brownells. Hopefully they will be in stock quickly. If you are in a hurry, Brownells also carries a CMMG bolt rebuild kit that includes the firing pin, extractor and all pins and springs to rebuild a 9mm bolt. http://www.brownells.com/rifle-parts/receiver-parts/parts-kits/repair-parts-kits/ar15-mk9-9mm-bolt-rehab-kit-sku100014674-65677-139040.aspx Link to comment
JWBaldree Posted January 11, 2017 Author Share Posted January 11, 2017 Update on mine. I contacted NFA and they asked me to return my bolt, as I mentioned other problems that I had fitting it to my PSA lower. The firing pin channel had a burr in it that I had to ream out, and I filed the bottom of the bolt about .03 as it was hitting the BHO deck and feed ramp of the lower. The upper is a NFA, for what that is worth. Sent it off about the 28th, and got it back with a SS firing pin yesterday. No mention of anything I did to the bolt to get it fixed, which is why they wanted to see it in the first place. Will test fire it as soon as I get around to plowing out the 20 inches of snow on the range road. Sorry 4T2, maybe I got the last pin for awhile. Link to comment
usmc1974 Posted January 11, 2017 Share Posted January 11, 2017 (edited) On 1/8/2017 at 8:40 PM, Frank34 said: I think the one that came with the black pin was too weak or maybe too short. I think you are right, It was letting the pin hit the primer way to hard,and snapping the tip off. I went to a Beretta 92 firing pin spring after I modified the firing pin all seems to work now. Edited January 11, 2017 by usmc1974 Link to comment
JHOWARD Posted January 11, 2017 Share Posted January 11, 2017 I think I have the pieces of mine still. It broke into 3 parts. Link to comment
usmc1974 Posted January 11, 2017 Share Posted January 11, 2017 7 hours ago, JHOWARD said: I think I have the pieces of mine still. It broke into 3 parts. Holy cow, the firing pin it's self broke in 3 pcs. Link to comment
JHOWARD Posted January 11, 2017 Share Posted January 11, 2017 Yup. Craziest thing I ever did see. Haha Link to comment
Aircooled6racer Posted January 12, 2017 Share Posted January 12, 2017 Hello: Looks like bad heat treating to me. They should have drawn it back or used better steel. Thanks, Eric Link to comment
usmc1974 Posted January 12, 2017 Share Posted January 12, 2017 3 hours ago, JHOWARD said: Yup. Craziest thing I ever did see. Haha WOW! I do think the spring was very weak.too. Letting it slam into the primer and back of the bolt. Link to comment
Flatland Shooter Posted January 12, 2017 Share Posted January 12, 2017 Don't know if it will help, but I'm done dry firing until I get some spare parts in hand. Link to comment
JHOWARD Posted January 12, 2017 Share Posted January 12, 2017 36 minutes ago, usmc1974 said: WOW! I do think the spring was very weak.too. Letting it slam into the primer and back of the bolt. Yeah. They sent a new spring, but it was obviously bad material or the treatment went wrong. Link to comment
jrswanson1 Posted January 12, 2017 Share Posted January 12, 2017 12 hours ago, Flatland Shooter said: Don't know if it will help, but I'm done dry firing until I get some spare parts in hand. https://www.amazon.com/Zoom-Luger-Precision-Snap-Pack/dp/B0002IKANW/ref=sr_1_3?ie=UTF8&qid=1484231951&sr=8-3&keywords=snap-caps+9mm Link to comment
4T2 Posted January 18, 2017 Share Posted January 18, 2017 New pin and spring arrived today from nfa, it's the newer stainless style posted earlier. Good service from them.Sent from my Pixel XL using Tapatalk Link to comment
blaster113 Posted January 30, 2017 Share Posted January 30, 2017 Have a CMMG bolt, not a NFA. Firing pin broke after about 1000 rounds or so. very little dry firing. I was very happy with the CMMG parts in my build until the FP broke. I've never had a firing pin break in any of my firearms, this after 25 years of shooting... Is it common for 9mm AR's to break firing pins like this? Link to comment
vinconco Posted February 4, 2017 Share Posted February 4, 2017 (edited) I noticed on NFA's website that they state: "**NOTE: Many Aftermarket drop in triggers use modified hammers which may not reset properly, or hit the firing pin square on the carrier which could cause firing pins to bind and snap. We recommend using only MILSPEC hammers with any 9mm, .40, or .45 blow back bolt carrier groups." I haven't seen this mentioned in this thread and I'm wondering if some of these problems are caused by the trigger / hammer. Edited February 4, 2017 by vinconco Link to comment
robertg5322 Posted February 4, 2017 Share Posted February 4, 2017 Mine happened with the trigger ATI put in the gun. Looked mil-spec. Link to comment
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