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M1A double lug receiver question

This is a discussion on M1A double lug receiver question within the Accuracy forums, part of the M14 M1A Forum category; I have an M1A Super Match which has a Double-Lugged receiver. All is well and good. However Fulton Armory M1A rifles that have double-lugged receivers ...


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Old July 21st, 2010, 10:11 PM   #1
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Cool M1A double lug receiver question

I have an M1A Super Match which has a Double-Lugged receiver. All is well and good. However Fulton Armory M1A rifles that have double-lugged receivers have the rear lug tapped so you can bolt the rear of the receiver into the stock bedding material much like a bolt guns action sits snug into it's stock. The bolt head that screws upward from the bottom of the stock into the rear lug of the receiver would be accessed by the trigger assembly being removed. As soon as I learned this I thought, "this is a really good idea!" I know a good gunsmith that can do this work for me. What do you think? Good Idea to get the receiver tighter and even more immobile into the bedded slots of the stock to stabilize accuracy even more?


Last edited by cobrafreak; July 22nd, 2010 at 11:27 PM.
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Old July 21st, 2010, 11:41 PM   #2
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I think it's a great idea! I don't have any of my SM rifles with this modification as of yet (my rear lug is bedded but not pillar bedded with the bottom screw).

The premise of having this modification sounds wise and makes sense, that the lug screw would secure the action to the stock.

So far all of my SM rifles shoot very well, but maybe when it comes time to rebed these rifles, I'd like that modification to be done. Normally, I rebed my own rifles, and I have looked at diagrams and studied this a bit and something that I would really like to try.

Git it done. This is one thing that I don't see any drawback to.

Tom O.

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Old July 22nd, 2010, 06:35 AM   #3
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Rear screw

Proper installation of a rear screw is one of the best modifications for accuracy that can be made on the M1A. Art

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Old July 22nd, 2010, 07:21 AM   #4
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I read this and it reminded me to grab my torque screws and pillars. I just finished building htese two and I am sending these out to get bedded and almost forgot to include them, Duh! Anyway I took a picture for you so you have an idea of what you want.
The one on the left is a double lugged LRB M25 andf the one on the right is a rear lugged LRB M14SA
Notice the pillars sticking out of the lugs

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Old July 22nd, 2010, 09:49 AM   #5
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Originally Posted by 82nd ABN View Post
I read this and it reminded me to grab my torque screws and pillars. I just finished building htese two and I am sending these out to get bedded and almost forgot to include them, Duh! Anyway I took a picture for you so you have an idea of what you want.
The one on the left is a double lugged LRB M25 andf the one on the right is a rear lugged LRB M14SA
Notice the pillars sticking out of the lugs
Fantastic picture! Tell me, is that an allen head bolt that you are using? What thread and pitch? Would you please take a picture if possible of the underside of your stock showing the bolt holes? Thank You.

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Old July 22nd, 2010, 10:15 AM   #6
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Sure thing here ya go. I am not sure what size the thread is I can tell you it is bigger than 10/32. They are fine thread though I will try and get you this info. It may be hard to see the hole in the front lug in the picture from this angle.


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Old July 22nd, 2010, 10:43 AM   #7
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Single Lugged Rifles - FYI

Some people that I respect claim that if the rear lug bolt is torqued down, it can lead to vertical patterns on the target. They prefer no bolt, or just keep it "firm".

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Old July 22nd, 2010, 12:44 PM   #8
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Smile Screw sizes

The screws used in these mods are 1/4" - 28 TPI. Some early LRB lugs were tapped for 1/4" - 20 TPI, but that was changed to standardize the size with other manufacturers.

While SAI lugs can be drilled and tapped, it is best to do this when rebedding. Lugged guns don't require the clamping pressure exerted by the trigger group and thr group should be bedded just to keep it from moving around under recoil.

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Old July 24th, 2010, 12:18 PM   #9
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82nd ABN, did your double lugged receiver come from LRB that way or did you/gunsmith add the front lug?


Last edited by seabass25; July 24th, 2010 at 03:54 PM.
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Old July 25th, 2010, 09:20 AM   #10
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Quote:
Originally Posted by cobrafreak View Post
I have an M1A Super Match which has a Double-Lugged receiver. All is well and good. However Fulton Armory M1A rifles that have double-lugged receivers have the rear lug tapped so you can bolt the rear of the receiver into the stock bedding material much like a bolt guns action sits snug into it's stock. The bolt head that screws upward from the bottom of the stock into the rear lug of the receiver would be accessed by the trigger assembly being removed. As soon as I learned this I thought, "this is a really good idea!" I know a good gunsmith that can do this work for me. What do you think? Good Idea to get the receiver tighter and even more immobile into the bedded slots of the stock to stabilize accuracy even more?
What I think is that the rifles you reference are single lugged with a rear lug and not double lugged.

Danny

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Old July 25th, 2010, 09:24 AM   #11
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Fantastic picture! Tell me, is that an allen head bolt that you are using? What thread and pitch? Would you please take a picture if possible of the underside of your stock showing the bolt holes? Thank You.
Who did you have do the front lug on the LRB Double Lug receiver? I wouldn't mind experimenting with a double lug setup one day.

Danny

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Old July 25th, 2010, 10:45 AM   #12
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Quote:
Originally Posted by seabass25 View Post
82nd ABN, did your double lugged receiver come from LRB that way or did you/gunsmith add the front lug?
Quote:
Originally Posted by gas_gunner View Post
What I think is that the rifles you reference are single lugged with a rear lug and not double lugged.

Danny
Quote:
Originally Posted by gas_gunner View Post
Who did you have do the front lug on the LRB Double Lug receiver? I wouldn't mind experimenting with a double lug setup one day.

Danny
Guys my doubles came from LRB. I just happened to step into them. I had just purchased a M21 from SAI and shortly thereafter joined the forum. After looking around I saw what we all eventually see those three little letters LRB. Well I was surprized to find that the shopp was only about 40 minutes from where I live on Long Island NY. Called them up and got on the list for a couple of rear lugged M25. Shortly thereafter I was told that there were 6 of these doubles that were out for front lugs but they were all spoken for but I could be on a stanby list. So a little more than a year went by and I dont know how many times I called (Lou's Daughter she is a Saint for putting up with me). Well just when you thought the day would never come the phone rings. I got the call they were in and that I could come in and get one. Someone had backed out on the deal. Well when I got there I jokingly said to Paul how many are available. He replied two. Well I had a feeling and said I'll take this one and this one. Done deal. I am sorry to say that you wont get LRB to make anymore anytime soon. I am not at liberty to explain why. A couple of people have seen these doubles and called to no avail. \
Fulton armory has made them in the past and I think they are currently making receivers so you might want to ask them for one. Its almost like I dont want to build on one of them to preserve it for the future. NOT! I already have a barrel for it. The first one is a winchester build and the next a SA build. Hurry up Lester!!! LOL

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Old May 18th, 2013, 10:43 AM   #13
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I need an education

I have an Armscop with no lugs. Built with USGI Parts from what I know. Can some one tell me what I have? I was trained on an M16. I was issued an M14 without anyone training. I only used it to qualify my 2nd year in. Where do I go here to start at the bottom and work my to a M14 education.

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Old May 18th, 2013, 11:13 AM   #14
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Quote:
Originally Posted by 82nd ABN View Post
Quote:
Originally Posted by Boot 1974 View Post
I have an Armscop with no lugs. Built with USGI Parts from what I know. Can some one tell me what I have? I was trained on an M16. I was issued an M14 without anyone training. I only used it to qualify my 2nd year in. Where do I go here to start at the bottom and work my to a M14 education.

Maybe this will help you out, your rifle was built on a std reciever ie... no lug front or rear. In 82nd's picture, Rifle #1 is double lugged, Rifle #2 is rear lugged.

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Old May 18th, 2013, 11:16 AM   #15
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Quote:
Originally Posted by Boot 1974 View Post
I have an Armscop with no lugs. Built with USGI Parts from what I know. Can some one tell me what I have? I was trained on an M16. I was issued an M14 without anyone training. I only used it to qualify my 2nd year in. Where do I go here to start at the bottom and work my to a M14 education.
Use the search feature, read, read and read. After you have read as much as you can stand, ask questions, than....... read.

The volume of information available here is mind blowing, some of these members have forgotten more than I have learned.
The first publication I would read is Differents book called:
"M14 Rifle History and Development" by Lee Emerson

I can't thank Mr Emerson enough, his research and publications have been the base of my education.

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From my library -
1. U.S Rifle M14 From John Garand to the M21 by R. Blake Stevens
2. M14 Rifle History And Development Fifth Edition Vol. 3 By Lee Emerson
3. Pictoral M14 Magazine Identification Guide Version 1.5 by Lee Emerson
4. The M14 Complete Assembly Guide By Walt Kuleck and Clint McKee
5. The M14 Owner's Guide and Match ConditioningInstructions By Scott A. Duff and John M. Miller
6. The U.S. .30 Caliber Gas Operated Service Rifles By Jerry Kuhnhausen
7. The M14-Type Rifle A shooter's And Collector's Guide by Joe Poyer
8. The Last Steel Warrior U.S. M14 Rifle by Frank Iannamico
m14brian
I linked this to the OP, these will keep you busy. No joke intended, get the books and read.

Find Tony Bens videos.

To the rest of the members who have provided their knowledge, experience and time, Thank You, it is not said often or enough.
Have fun and feed your addiction.


Jim

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