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cracked bolt |
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james_hugh
Recruit Joined: Nov 07 2022 Location: United States Status: Offline Points: 3 |
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Posted: Nov 17 2022 at 5:59pm |
Hello all-
I am brand new to the forum - I have a second M1 carbine. I had always wanted one since I was young. My most recent acquired carbine is a Winchester. The bolt and firing pin are Underwood and I ended up getting a cracked right lug recently. Broken bolt is a flat top. I elected to put a round bolt to replace it with from Onyx arms. Coincidentally it is a Winchester bolt. I attempted to re-install with the bolt tool and the Underwood firing pin does not fit in all the way. It gets hung up at the end where it is more thick. Do I need to try and source a series III firing pin that is also a Winchester? The previous bolt and pin worked fine prior to the catastrophic lug parting. Here is a pic of old firing pin as far as it can go. I tried reaching out to one armory who did not offer any more info beyond him not having that issue before. Emailed Onyx where the bolt came from -,...and no response. Hoping for any insight.
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bonnie
Recruit Joined: Aug 28 2016 Location: N.C. Status: Offline Points: 89 |
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Did you clean the new bolt inside and out before attempting to assemble?
Any issues with the receiver after the broken bolt lug? |
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W5USMC
Moderator Group Joined: Apr 29 2017 Location: Missouri Status: Online Points: 2958 |
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Agree with bonnie, make sure you clean the inside of the bolt. Has the new bolt been refinished? Maybe they parkerized the FP hole making it smaller than it should be. Could you by chance post a clear picture of the marking on that new bolt.
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Wayne
USMC Retired NRA Life Member |
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james_hugh
Recruit Joined: Nov 07 2022 Location: United States Status: Offline Points: 3 |
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Thank you for the quick replies. I feel fortunate that there is this forum.
I still have to order my go and no go. and extractor, spring and plunger.
yes the bolt is clean and dry but I did run a brush through it with CLP. This is not an obstruction and there is no cosmoline. It abruptly stops at the end of the firing pin hole at the leading outside diameter of the firing pin rear shank where it becomes fatter. I will try to get more pics here in a second. My phone camera is on its last leg. I hate paying a lot for a new phone - I can afford them but I try to eek out as many years as possible with them lol could care less if I have the new new phone. |
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floydthecat
Hard Corps Joined: Oct 13 2016 Location: Mississippi Status: Offline Points: 1998 |
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Is that a new never-been-fired bolt?
This should be a simple problem to solve. Assuming the pin is proper, the channel has to be blocked by something or maybe improperly machined. If you still have the cracked bolt and the pin fits freely, you can eliminate the pin as a suspect.
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james_hugh
Recruit Joined: Nov 07 2022 Location: United States Status: Offline Points: 3 |
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Here is the marking on the right lug of the new bolt
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GotSnlB28
Hard Corps Joined: Jan 01 2016 Location: WI Status: Offline Points: 896 |
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Try hand turning a 3/16 drill bit in from the rear and see if you hit anything. I had one bolt with fresh parkerizing that was a little crusty, that cleaned it up.
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kro1970
On Point Joined: Jan 01 2016 Location: Central Florida Status: Offline Points: 301 |
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If the bolt is freshly bead blasted then parked there is good chance there blast media in the bolt. The drill bit method previously mentioned should break it up. Check the end of the drill bit after a few turns and you should see debris.
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Beezer
On Point Joined: May 21 2020 Location: Cleveland OH Status: Offline Points: 171 |
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I bought an Underwood bolt that had dried grease packed in the firing pin hole. My pin would not fit in properly until I soaked it in mineral spirits for a few hours and used a plastic pic to remove the wad of grease. After cleaning and lubricating the pin fit properly and have been using the bolt ever since. Hope your issue is similar as it was an easy fix.
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