40-X One piece Base

[hudsongunner]

Re: 40-X One piece Base

Hi fellas,
My serial numbers on my 2 40X .22's are:
20XXXb & 20XXXb

From the quoted post it looks like my guns are post '74 and a regular Rem. 700 Badger SS 20MOA base will fit with no shims.
Please correct me if I am wrong.
Thanks,
Paul


<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: sinister</div><div class="ubbcode-body">Found it:

<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">Remington Receiver Information (change in height of rear receiver bridge):

O.K. guys get ready to file this away somewhere that you can remember where you filed it, unlike me. Since I couldn't find my original information I had to contact Remington directly. It took about 2 weeks but I finally got the straight scoop so here it is as clear as I can make it.

There was a .017" increase in the rear receiver bridge on the model 700's in 1974. Prior to 1974 there were no letter prefixes on the serial numbers. So if you have a gun without a prefix on the serial number it is pre-'74 and the rear receiver bridge is .017" lower than current production guns.

Norma who finally got the answer for me also recommended a book by John Lacy - The Remington 700 - A History and Users Manual. She said it covered them from 1962 through 1987. The only link I have been able to locate for the book is: http://www.remingtonsociety.com/books/M700LacyBook.shtml

I hope this helps clear up an confusion that is out there.
Later,
Byron
Wednesday, July 23, 2003</div></div>

<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">Regarding the Lacy book, according to the web page of the link I provided you can get a hardcover copy directly from the author, for $49.95, plus $5.00 shipping and handling

John Lacy
809 West Stone, Brenham, TX
email: slacy (at) industryinet.com</div></div> </div></div>

 

[SDWhirlwind]

Re: 40-X One piece Base

Just curious as to how you arrive at the fact that your 40-XB's are 'post' 74????? From the serial numbers your guns are '63-64 yr of manufacture. Date codes on barrels should give you exact month/year. Also while the above quote you use is in reference to the 700 and the 40-X serial numbers are an entire different animal. However the external bridge height specs are the same for early vs. later production of both the 700 and 40-XB's.

Both of yours should require earlier bases and NOT "current production".

Just my .02 worth.

Respectfully,
Dennis

 

[donws2]

Re: 40-X One piece Base

SDWhirlwind is correct. Your two 40Xb's are from 1964. The transition from the 722 to the 700 style receiver happen in the 18xxx/19xxx serial number in late 1963 or early 1964. There are some 722 Heavy barrel guns out there as well but most of those were civilian purchased rifles and not Government contract rifles.
The problem with your receivers is not which type of receiver but the small amount of difference in shape/size every milled part has. It's call tollerence by machinist but every time another part is made the cutting tool is worn down just a little, the new part may not be held exactly like the last and just a ton of other things that are going on make little changes to the way a part comes out. You also need to remember these receivers are hand polished before they are blues. The polishing does remove a little material. It all adds up. Every 700 made today has the same problems that the ones fourty years ago had. Chances are you could get a base and receiver that fit very well together but then you may not. I perfer to shim my bases but the use of a bedding compound to fill the gap is just as good. Shims to me are just easier and it may well be I'm just lazy.

Donald

 

[hudsongunner]

Re: 40-X One piece Base

Ok, so I am confused about the date codes...my guns have the following codes on the barrel:
NCLH and NCLX
Either I have become dense or my 2 week old baby had shrunk my brain. The team 40X site says there are two numbers in the code and I have 4. it looks like the L means February but there are about three sets of year codes alphabetically.

Any help is appreciated

-Paul


<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Don in SC</div><div class="ubbcode-body">SDWhirlwind is correct. Your two 40Xb's are from 1964. The transition from the 722 to the 700 style receiver happen in the 18xxx/19xxx serial number in late 1963 or early 1964. There are some 722 Heavy barrel guns out there as well but most of those were civilian purchased rifles and not Government contract rifles.
The problem with your receivers is not which type of receiver but the small amount of difference in shape/size every milled part has. It's call tollerence by machinist but every time another part is made the cutting tool is worn down just a little, the new part may not be held exactly like the last and just a ton of other things that are going on make little changes to the way a part comes out. You also need to remember these receivers are hand polished before they are blues. The polishing does remove a little material. It all adds up. Every 700 made today has the same problems that the ones fourty years ago had. Chances are you could get a base and receiver that fit very well together but then you may not. I perfer to shim my bases but the use of a bedding compound to fill the gap is just as good. Shims to me are just easier and it may well be I'm just lazy.

Donald </div></div>

 

[hudsongunner]

Re: 40-X One piece Base

Thanks

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: SDWhirlwind</div><div class="ubbcode-body">Just curious as to how you arrive at the fact that your 40-XB's are 'post' 74????? From the serial numbers your guns are '63-64 yr of manufacture. Date codes on barrels should give you exact month/year. Also while the above quote you use is in reference to the 700 and the 40-X serial numbers are an entire different animal. However the external bridge height specs are the same for early vs. later production of both the 700 and 40-XB's.

Both of yours should require earlier bases and NOT "current production".

Just my .02 worth.

Respectfully,
Dennis </div></div>

 

[SDWhirlwind]

Re: 40-X One piece Base

Paul

http://www.rimfirecentral.com/forums/showthread.php?t=9555

Somewhere on RFC it explains first and last letters of the 4 stamped, I am too tired and lazy with my dialup to find it. Middle letters are your month and yr.

CL on both= April of '64

 

[donws2]

Re: 40-X One piece Base

The first letter is an inspection/inspector mark.
The last letter is a assemmly code. This is some times a number or not even there? I've had several US 40X rifles with just three letters.

The second letter is the month. C = April
The third letter is the year. L = 1964

For some reason Remingtons have either three or four letters in the date code. No one seems to ever mention that not all of the letters have anything to do with the date. Hope this helps to clear it up for you. Plus, all the contract heavy barrel 40X rifles were completed in three years. So it's easy to guess when it's made by the serial number for most of them.

The list below shows the error by not stating that the [VERY first letter] is the inspector. I assume the author meant that the first letter for the date is the month.


Month Codes: [first letter]
B - L - A - C - K - P - O - W - D - E - R - X
1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12

Year:______Code: [second (and third*) letters]
1930_______ Y
1931_______ Z
1932_______ A
1933_______ B
1934_______ C
1935_______ D
1936_______ E
1937_______ F
1938_______ G
1939_______ H

1940_______ J
1941_______ K
1942_______ L
1943_______ MMZ
1944_______ NN
1945_______ PP
1946_______ RR
1947_______ SS
1948_______ TT
1949_______ UU

1950_______ WW
1951_______ XX
1952_______ YY
1953_______ ZZ
1954_______ A
1955_______ B
1956_______ C
1957_______ D
1958_______ E
1959_______ F

1960_______ G
1961_______ H
1962_______ J
1963_______ K
1964_______ L
1965_______ M
1966_______ N
1967_______ P
1968_______ R
1969_______ S


Donald

 

[hudsongunner]

Re: 40-X One piece Base

Awesome...very helpful.
Thank you Dennis and Donald.

 

[hudsongunner]

Re: 40-X One piece Base

Very strange...I mounted a standard Badger Ord. 20MOA base from one of my 700's on one of my .40X listed above and it fit fine with no gap. I will try it on the other gun sometime this weekend also.
Any ideas?

 

[SDWhirlwind]

Re: 40-X One piece Base

We are only talking .017 difference in bridge height according to Remington's factory specs. However with the +/- tolerances allowed in machining the receiver and the base and polishing the receiver to blue those thousandths could be added to or subtracted from. You may well end up with a particular base on a particular receiver being near perfect fit. A 1pc base would be less issues then a 2pc.

On a late 70's 40-XR receiver using a 2pc Leupold base I had to shim rear base .030 so rings would line up without excessive lapping. Another set of rings and bases may not have required as much???

Only issue may be that you might not have a full 20moa of cant if the rear sets a bit lower???

I have only been harping on the Remington rear receiver bridge change to bring it to the attention that owners should check for alignment instead of just assuming "current production" will work and tighting shit down and ruining a nice scope, leaving ugly ring marks or causing some tracking issues because of a tweaked/sprung tube. Not trying to start any arguements over what does and does not work. One dipstick on CMP forums was bond and determined I was full of shit because HE never had problems with Weaver 2pc bases and Leupold Rifleman rings. He was so bright that he claimed because I installed the "precision 40-X receiver into a different than factory stock I 'warped' the receiver which caused the issues, not a factory spec change"! Guess some people just always want to be right?

Again nobody stated there WILL BE a problem just that there MIGHT BE a problem because of Remington receiver changes over the yrs.

HTH and clears things up.

Respectfully,
Dennis

 

[hudsongunner]

Re: 40-X One piece Base

Thanks Dennis...

I was hoping it would fit with no issues. I guess that the next step is once I receive my new glass to mount it up and see if I have enough MOA to work with. If not I will either shim it or get the proper base for this gun.
Again, Thanks for all the info.

I do have one more question...I have been shooting the guns for a while but never did any work myself. I am looking to replace the wood stock on my 40X with either a M40A1 or A5. I see them for sale from time to time for 700SA. what will I need to do to make a 700 stock fit the 40X?

I also found a McMillan stock that fits a Re, 788. Do you know what will need to be done to make that fit my 40X?

Again,
Thanks...I am a member on a few other boards but SH has become my favorite. Seems that most people here are good to guys.

-Paul

 

[SDWhirlwind]

Re: 40-X One piece Base

Your 40-X barreled receiver should drop into a stock with a barrel channel inlet for an M40A1 barrel blank. The receiver part will fit unless it has been bedded and the prior bedded receiver and or lug are of smaller dimensions then yours. In that case material would need to be removed and it rebedded for your barreled action. If you buy a used one with a smaller barrel channel it will need fitting to yours.

I think I know which stock you are referring to and I think? it could be reworked but......! If you aren't comfortable doing the work yourself it would need to be done either by your smith or returned to McM. Either will cost you well over $100 and you will have the incorrect bottom inlet for your single shot. If possible it would have to be inletted for BDL bottom metal and that purchased to "plug the hole". I don't know how the depth of the 788 stocks compare to a 700 and screw spacing is different as there were at least 3 different lengths of 788's and I was told there were 4 but cannot confirm without particular calibers to measure.

Really better off to get a proper ADL inlet for your particular setup from McM and have it all fit and look descent. Sometimes trying to save a buck doesn't materialize especially if you have to pay someone for a rework after you acquire it.

 

[hudsongunner]

Re: 40-X One piece Base

Thanks...you got it I would rather pay a couple hundred more and do it right the first time.
-Paul

 

[hrt4me]

Re: 40-X One piece Base

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: SDWhirlwind</div><div class="ubbcode-body">
http://www.rimfirecentral.com/forums/showthread.php?t=9555

Somewhere on RFC it explains first and last letters of the 4 stamped, I am too tired and lazy with my dialup to find it. Middle letters are your month and yr.

CL on both = April of '64</div></div>

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Don in SC</div><div class="ubbcode-body">The first letter is an inspection/inspector mark.
The last letter is a assemmly code. This is some times a number or not even there? I've had several US 40X rifles with just three letters.

The second letter is the month. C = April
The third letter is the year. L = 1964

For some reason Remingtons have either three or four letters in the date code. No one seems to ever mention that not all of the letters have anything to do with the date. Hope this helps to clear it up for you. Plus, all the contract heavy barrel 40X rifles were completed in three years. So it's easy to guess when it's made by the serial number for most of them.

The list below shows the error by not stating that the [VERY first letter] is the inspector. I assume the author meant that the first letter for the date is the month.

Month Codes: [first letter]
B - L - A - C - K - P - O - W - D - E - R - X
1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12

Year:______Code: [second (and third*) letters]
1930_______ Y
1931_______ Z
1932_______ A
1933_______ B
1934_______ C
1935_______ D
1936_______ E
1937_______ F
1938_______ G
1939_______ H
1940_______ J
1941_______ K
1942_______ L
1943_______ MMZ
1944_______ NN
1945_______ PP
1946_______ RR
1947_______ SS
1948_______ TT
1949_______ UU
1950_______ WW
1951_______ XX
1952_______ YY
1953_______ ZZ
1954_______ A
1955_______ B
1956_______ C
1957_______ D
1958_______ E
1959_______ F
1960_______ G
1961_______ H
1962_______ J
1963_______ K
1964_______ L
1965_______ M
1966_______ N
1967_______ P
1968_______ R
1969_______ S</div></div>

Thanks for the info.

What is the best way to measure the actual "gap" on my Rem40XB receiver?