M40A5 Donor Action

kydron

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I'm currently collecting parts for an M40A5 rifle and will likely be using GA Precision for the actual build. I'm looking to validate my assumptions when selecting the donor action.

1) E or G prefix actions are preferred but none of the "correct" serial number ranges are actually available since they were not released to civilians. In that case, any older action with a E or G prefix will work.
2) I found several used, but like new Remington 700 rifles on gunbroker. There are a couple of rifles that I am looking at that have a serial number of 'E665xxxx'. They come with the old Remington J-Lock firing pin assembly. I assume I can replace these with a current production firing pin assembly like this one: https://www.brownells.com/rifle-par...ssembly-blue-sa-sku767000916-78765-51713.aspx . Would this be "parts correct" barring the finish? I assume GAP will be refinishing the entire rifle anyways.

Finally, if there's a better way to go about finding an appropriate donor action that hasn't been butchered with I'm all ears.

Thanks.
 

navynambu

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"1) E or G prefix actions are preferred but none of the "correct" serial number ranges are actually available since they were not released to civilians... "

Incorrect, in my understanding. I understand approx 560 new E prefix serialized receivers were initially purchased for the initial builds of the M40A5s. The range for those initial new 560 actions with the E prefix is known, but not generally discussed.

I understand most of the rest of the A5s were subsequently built (rebuilt) from recycled A3s sent back to PWS.

I dimly understand they later bought some new G prefix receiver, but I personally am not aware of how many of these G prefix receivers were used or purchased.

Also, there are original tube count booklets for M40A5 floating around, and those of course show the original gun serial numbers. If the barrel was replaced, then the old tube count booklet was tossed and a new round count book was sent out on the gun with the new barrel (so it may have been that sometimes the old booklets went loose; I suppose the booklets also got separated from the guns, too, but I don't know anything about that possibility).

Of course there are lists of known A5s also floating around, and also photos of A5s showing serial numbers.

This is just my understanding; I was not there.

E665xxxx isn't the correct range in MHO; you'd be better off looking for one in E67XXXXX

Can anyone confirm the total number of M40A5s produced, maybe around 1,000 ?
 

Skunk

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The pic shows that E-prefix guns spanned more than just the E676xxxx serial range most quote. Granted, this rifle is an A1, that receiver could have been carried over to an A3, A5 and maybe further.

In my opinion, the E665xxxx the OP mentioned would be "correct" to build from.
 

molonlave

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I know a guy that is selling an A3 with an E6xxxxxx 😉. Couple of mods and you have yourself an A5

 

navynambu

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Paul, what's the second digit in your above photo of the M40A1, a 3, or maybe an 8 , so E63...? I cant' quite see it for sure. I have an M40A1 list going. Great photo, thanks.

I found a list of known guns with E and G serials from in service photos in an old file of mine including: E6547189 (M40A1); E6704912 (M40A5); E6763571 (M40A5); E6765371 (M40A5); E6763788 (M40A5); E6763874 (M40A5); E6763901 (M40A5); E6763950 (M40A3); E6764041 (M40A3); G6654291 (M40A5); G6654294 (M40A5); G6654295 (M40A5); G6654309 (M40A5); G6752839 (M40A5). This list used to be posted over on the M40 Forum, supported with some photos of some of these in service guns themselves that were posted in the Gallery there. I don't see the list there now, maybe someone you know who pulled it down, but photos of some in service guns are there in the Gallery.
 

Pinmaster

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So the G prefix started in the 6,654,xxx range? My A5 clone is G6,335,xxx... not very close but it will have to do.
 

Random Guy

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what's the second digit in your above photo of the M40A1, a 3, or maybe an 8 , so E63...? I cant' quite see it for sure. I have an M40A1 list going
Attached are a couple of E prefixes for your list (circa 2016 pics at Quantico)

As to the original question:
There are a couple of rifles that I am looking at that have a serial number of 'E665xxxx'.
...that serial range falls between the two real M40A1s shown (E637xxxx to E670xxxx), so to me its fine for a replica.
 

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kydron

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Thanks for the info everyone. This is very helpful. Does anyone have info regarding the correct firing pin assembly? I am assuming this is a standard Remington part that can be swapped in replacement of an old J-Lock FPA?
 

FUNCTIONAL

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Thanks for the info everyone. This is very helpful. Does anyone have info regarding the correct firing pin assembly? I am assuming this is a standard Remington part that can be swapped in replacement of an old J-Lock FPA?
Correct, nothing special on the fp assembly.
 
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