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Research: M14 flappered butt plate types

This is a discussion on Research: M14 flappered butt plate types within the Reference forums, part of the M14 M1A Forum category; I know the steel buttplates are indeed Chinese. Yes, they will work fine, but remember the original specifications in developing the M14 was to keep ...


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Old October 20th, 2005, 06:40 AM   #31
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I know the steel buttplates are indeed Chinese. Yes, they will work fine, but remember the original specifications in developing the M14 was to keep the weight down. With the addition of the steel flapper circa 1960/61 it required an aluminum body for weight restrictions.

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Old October 20th, 2005, 06:03 PM   #32
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I figured they would be desirable, just because you could reparkerize the whole thing if the finish ever got worn. The chinese buttplates I have all have steel doors, and everything else on it is steel. I put a magnet to every piece. The chinese buttplates aren't bad, but you have to sort through them. I'd rather just stick with the USGI though. On my buttplates the trapdoors seemed to be a pain to open and close, but they weren't oiled up either.

Quote:
Originally Posted by Oxmix
R4 fan,
I thought I heard that the Chinese butt plates, because they are steel, were desirable. Is the trap door on your butt plates aluminum or steel?

Regards

Ox


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Old October 20th, 2005, 06:07 PM   #33
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Here is my entry for the chinese buttplates. I have taken the photos from 13 new buttplates, and found a number of different variations.

In this photo the buttplate flapper on the left has checkering, and if you look closely it is missing a bunch of the little "squares." When you look at the buttplate in person, you can really see it. The buttplate on the right is what the other 12 chinese buttplates looked like.

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Old October 20th, 2005, 06:11 PM   #34
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These photos show the buttplate upside down, with the flapper open. All of these were welded and ground down (except for the middle one showing the entire seam between the two pieces). Some show different parts of the seam, and one has a ton of pitting. Most of the grinding on these is between where the red arrows are, and the top screw hole.

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Old October 20th, 2005, 06:15 PM   #35
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On the inside of the buttplates: On the first two, you see the left one has support metal around the top screw hole, and the other does not. I saw one that had a bead of weld along the seam above the top screw hole (on a buttplate without the extra metal support), but I forgot to take a photo of it.

Some of the trap doors have raised or intented circular "dots." They either have none, one, or two.


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Old October 20th, 2005, 06:21 PM   #36
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And lastly, the flapper hinge area. The left photo shows the hinge either has two raised dots, or none at all. The second photo shows the extra hole (like on the USGI buttplates) and on the other it was omitted. Both sets of buttplates in the first photo are the same as those in the next photo, only flipped over.

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Old October 21st, 2005, 03:48 AM   #37
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R4 fan, thanks for the input on the Chinese butt plates. The dots on the bottom side of the trap door look like casting sprue marks. Some trap door castings had one sprue and some had two it seems. It also looks like they did a weld over the joint for the flapper then ground it to hide it. By your photos, in some cases the joint was not completely covered by the weld.

All of my USGI butt plate flappers have the hole on the left side of the hinge. The Chinese copied this but also have the flapper hinge with the two dots (or rivets?). I'm thinking the missing squares on the flapper means the casting wasn't formed completely?

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Old October 21st, 2005, 04:22 AM   #38
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Different, on this buttplate there was no weld on the front, and the rear joint (on the inside) was welded instead.

The two dots on the on the flapper hinge are just raised indents, not rivets. I'm not sure what they are there for. The missing squares on the flapper are completely missing. I agree that must be a manufacturing mistake in either the casting method or the mold itself. It was only like that on one flapper.

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Old October 21st, 2005, 12:04 PM   #39
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Who would have ever thought that one part could have so many variations.
It does keep it interesting though.

Regards

Ox

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Old October 22nd, 2005, 03:02 AM   #40
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Quote:
Originally Posted by R4 fan
Different, on this buttplate there was no weld on the front, and the rear joint (on the inside) was welded instead.

The two dots on the on the flapper hinge are just raised indents, not rivets. I'm not sure what they are there for. The missing squares on the flapper are completely missing. I agree that must be a manufacturing mistake in either the casting method or the mold itself. It was only like that on one flapper.

R4 fan, thanks for the additional information. I'll post a "Butt Plate Recap" in my next post to include the Chinese butt plates. The alternating placement of the weld on one side or the other of the flapper-to-butt plate joint is poor Quality Control IMO but it does keep me scratching my head. :D

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Old October 22nd, 2005, 03:12 AM   #41
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M14 Flappered Butt Plate Summary to date:

USGI

Group 1 flappered butt plates have bumps around the bottom screw only.

Type 1A - round bumps with two weld dimples and no trap door lock
Type 1B - square bumps but no welds
Type 1C - square bumps with two weld dimples

Group 2 flappered butt plates have bumps around the top AND bottom screws.

Type 2A - round bumps with no weld dimples, truncated hinge slot corners, and a raised pin well
Type 2B - square bumps but no weld dimples or dimples filled in
Type 2C - square bumps with two weld dimples (KMT made these)
Type 2D - square bumps with two SMALL weld dimples

Notes: USGI butt plate flappers have one hole in the left side of the hinge. The butt plate itself is made of aluminum alloy.

Chinese

Type 1 - The flapper has two raised indentations on the right side of the hinge.
Type 2 - The flapper has one hole on the left side of the hinge.

Notes: The butt plate itself is made of steel. The flapper-to-butt plate joint has a weld build up that is ground flat.


Keep the input, suggestions, corrections, comments and updates coming in!

Thank you!

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Old October 22nd, 2005, 08:07 AM   #42
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just a question for clarity.... when you say left side of flapper, are you looking at the flapper from the outside with the hinge wings at the top?

If so, the hole on the left is in addition to the hole for the hinge pin.

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Old October 22nd, 2005, 08:22 AM   #43
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Hawk, good point. Clarity is important. By the left side of the hinge I mean when the flappered butt plate is installed on the stock and the muzzle end is pointed down range (away from you), the extra hole is on the left (receiver bolt lock) side of the hinge.

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Old October 25th, 2005, 09:58 AM   #44
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Exclamation

I got one from Fred's today, USGI that has a small "10" on the back of the trap door. It is a Factory Cast part. I've never seen this on any other. No other marks. Looks like a type 1C.

I have Two others that are USGI, and are currently on two of my stocks.

First is a Type 1C "KMT" Marked, gold colored Trap door. Removed from a USGI Stock at Armscorp.

Second is a Type 2D, no marks anywhere. The dimples are only slightly smaller than the "KMT" marked 1C. Removed from a Fred's Presentation walnut TRW stock.

Also, I found another part # that is different from the one you listed Lee.
Out of PM 750-11, dated 1 FEB 1967, Pg 24; "I'm tougher'n you think!"
'Support can re-place the stock with FSN 1005-771-4617 and the buttplate with FSN 1005-690-4067.'


Last edited by Lex_Ordo; October 25th, 2005 at 07:57 PM.
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Old August 28th, 2016, 07:58 PM   #45
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Btt for those that don't know about Google.

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