Replacement Bolt Assembly |
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AJ Dragon
Groupie Joined: January 14 2016 Location: Wa. Status: Offline Points: 40 |
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Posted: February 26 2016 at 9:25am |
Hi
I'm getting a replacement bolt assembly next month from Springfield Sporters, and I was wondering what do I need to look for in order to make sure it fits properly.
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Bear43
Special Member Donating Member Joined: August 11 2010 Location: Doland, SD Status: Offline Points: 3059 |
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It's the locking lugs. The locking lugs should both bear evenly and you need to mark the lugs on the bolt body to check that. Once you ensure the locking lugs bear evenly then you can start to look at headspace.
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Canuck
Special Member Donating Member Joined: January 17 2012 Location: Agassiz BC Status: Offline Points: 3532 |
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I mirror what Bear43 said. We can help you in your quest, just keep asking as many questions as needed, many here will respond.
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Castles made of sand slip into the sea.....eventually
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ikesdad
Senior Member Joined: May 10 2007 Location: Western Slope Status: Offline Points: 393 |
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For a SMLE or a #4 ?
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Pro Deo et Patria
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Shamu
Admin Group Logo Designer / Donating Member Joined: April 25 2007 Location: MD, USA. Status: Offline Points: 17566 |
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Locking lug engagement, head over rotation, & headspacing.
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Don't shoot till you see the whites of their thighs. (Unofficial motto of the Royal Air Force)
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Bear43
Special Member Donating Member Joined: August 11 2010 Location: Doland, SD Status: Offline Points: 3059 |
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ikesdad, the fitment procedure for either a SMLE or a No 4 is the same.
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AJ Dragon
Groupie Joined: January 14 2016 Location: Wa. Status: Offline Points: 40 |
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Hi
I have the No4 Mk1. Are you talking about these. |
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ikesdad
Senior Member Joined: May 10 2007 Location: Western Slope Status: Offline Points: 393 |
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Yeah, I know but was only curious which he had. I'm starting to get into the SMLEs a bit after a garage wall full of #4s.
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Pro Deo et Patria
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AJ Dragon
Groupie Joined: January 14 2016 Location: Wa. Status: Offline Points: 40 |
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Hi
I take it that I'll need to get some of that blue contact liquid so that I can make sure the lugs are making full contact at the same time on each side of the receiver?
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Bear43
Special Member Donating Member Joined: August 11 2010 Location: Doland, SD Status: Offline Points: 3059 |
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My apologies, ikesdad, I misunderstood your post.
AJ, yes, that is exactly it. Those lugs on the bolt must both bear evenly on their respective recesses in the body. |
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Shamu
Admin Group Logo Designer / Donating Member Joined: April 25 2007 Location: MD, USA. Status: Offline Points: 17566 |
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Yes, the lugs having the similar (if not the same, which is better) contact is vital.
However! Don't be put off by a little bottle of chemicals. Candle smoke, Magic marker dye & so on will do the same thing, verify how much bolt is locked to how much action body. |
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Don't shoot till you see the whites of their thighs. (Unofficial motto of the Royal Air Force)
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ikesdad
Senior Member Joined: May 10 2007 Location: Western Slope Status: Offline Points: 393 |
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SS is currently closed for awhile. Death in the family as per their site.
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Pro Deo et Patria
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Zed
Special Member Donating Member Joined: May 01 2012 Location: France Status: Offline Points: 5569 |
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I recently fitted a new bolt to my SMLE. I would strongly recommend reading articles by Peter Laidler regarding bolt fitting. It certainly helped me.
I used an Arkansas stone (better than carburundum) to remove the high spots to get contact on both sides and tapped some beer can metal around the bolt to avoid scraping that when using the stone on the lugs. Make very careful and slow process so you don't overdue it! To get good head space you don't want to be removing too much off the lugs. You fit the bolt lugs to match the rifle! do not try and alter the rifle receiver lug area. There is a thread here regarding my bolt fitment; but I'm an amateur and rely on the articles written by the pro's. |
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It's nice to be important, but it's more important to be nice!
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AJ Dragon
Groupie Joined: January 14 2016 Location: Wa. Status: Offline Points: 40 |
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Hi
Thanks for the tip about the articles by Peter Laidler. The next thing I need to get is the stone, the head space gauges, and the blue dye.
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Zed
Special Member Donating Member Joined: May 01 2012 Location: France Status: Offline Points: 5569 |
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The stone I bought online; you'll be better served in the USA for that.
You definitely need the proper head space gauges; I bought a full set of Oakie gauges. Having the set of 3 helps because you need to know how much metal you can remove; and it's not very much! literally a couple of thousandths of an inch. I managed to get contact at both lugs and pass the Go gauge (70 thou) test, which gives me 4 thou to spare before the Field gauge fail at 74 thou. If I hadn't had the 70 thou gauge it would be too easy to end up very close to the field gauge limit, which was where the original bolt was! It will be difficult to get the same size contact area on each side; so go very carefully and keep checking it after every couple of stroke of the stone. You really do need to take the time; it's easy to wreck the bolt. once I got contact on both sides, I stopped. Then test fired it with a few rounds to settle it in a bit, then rechecked the contact. Best of luck, Zed.
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It's nice to be important, but it's more important to be nice!
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Shamu
Admin Group Logo Designer / Donating Member Joined: April 25 2007 Location: MD, USA. Status: Offline Points: 17566 |
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Make sure you get MilSpec headspace gauges (like the Okies mentioned.) Many are SAAMI which is a different spec & not correct.
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Don't shoot till you see the whites of their thighs. (Unofficial motto of the Royal Air Force)
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