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gap in the stock ?!

2113 Views 12 Replies 7 Participants Last post by  Ric
hi, my SA M1A it is quite accurate , but i noted that some shoot randomly going down on the target few inches compering with the rest of the shoots ( 100 yds ). Maybe depend on me but i noted a slitly gap betwen the back part of the receiver and the stock. the gap is slitly and you note it only if you look it trow a light , now i'm thinking to add material on the back part of the stock where the receiver touch, I'm thinking of kind of sintetic material or it is better wood ? any suggestions ? Thanks ric
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what type stock do you have? had the same problem when I switched from SA Walnut stock to USGI; in fact it wouldn't go in at first because of the humidity in the air...

later it settled down, & there is little, or no gap...

glass bedding would help, if you have wood stock 8)
Hi Jefferson, it is the wood stock non GI, i think springfield Genesco buy wood stock from boyds stock. tks Ric
do a SEARCH for GLASS BED &/or STOCK GAP, I'm sure you'll find some more info
I have a SA Inc. M1A that had the gap at the rear of the reciever. Once i swapped the trigger group out for a USGI trigger group, it tightened everything up and there is no more gap.

The rifle was a tack driver from the start and this did nothing to improve on the rifles accuracy. It just looks better now. :mrgreen:

I wish I had a digital camera so I could post a picture, because I do not know where your stock gap is located. However on every GI Garand and GI M14 stock I own, the heel of the stock is slightly raised, or maybe just the wood in front of the heel is slightly relieved. When a receiver is put into a GI stock the horseshoe section of the receiver is tight on the heel, no air gaps between it an the stock, but just behind the receiver legs to the horse shoe section, there is an air gap. On both sides of the stock. It is real, it is there, and it has to be deliberate. So the question is why?

And when you think about it, it is a gas vent. If something bad happens up front, and gas gets back into the action, what ever gas gets that far back, the air gap will cause it to vent out the sides. The horse shoe section will block gas movement rearward, protecting the shooters eyes as gas is vented out the sides. If the side gas vents are sealed you run the risk that on rushing gas will lift up the back of the receiver and go into the shooters face.

On all my match M1a’s I have the gap, and having it does not hurt accuracy.
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In short, it's supposed to be there.

Here is a link to Dean's Gun Restoration's Stock Page. They have an excellent explanation as to this gap. While they explain it on a M1 Garand, it still applies to the M14. I have also had a former USMC armorer who was very familiar with match grade upgrades on the M14 explain this the same way. All the match grade stocks that I've handled are bedded with the gap between the legs and the heel of the receiver.

Take Care,

Tony: Yup, as long as the heel is firmly on the stock the gap in the area between the heel & the receiver legs is absolutely supposed to be there. Esp on USGI synthetic stocks. I've gotten into this with a certain individual several times now... ;)

It's hard to know sometimes from a poster's description exactly what gap they are talking about, as some people do have M1As where the heel is off the stock. This is often, but not always, due to the "step" on the underside of some M1A receivers. If the step is there the stock will need to be inletted for a correct fit. Easy job. The step I mentioned looks like this.

I know you know all this, just thought it was worth reiterating. :oops:

On Target! The relief cut for the step can be seen on M1A stocks from that time period. I get many requests to fill that gap on my synthetics. When I do, I top-bed the action after filling the selector cut-out, then make a slight relief of the area so the appearence is better but the very slight gap is there. However, I caution that it may require fitting to thier action. It's usually not as noticeable on the wood stocks.

Take Care,

SlamFire said:
...On both sides of the stock. It is real, it is there, and it has to be deliberate. So the question is why?
If you follow the link Tony posted for DGR, you'll see that the stock is relieved in that area to ensure that the receiver will not rock back and forth in the stock, degrading accuracy. The relief cut ensures that the heel makes firm contact with the stock, and when put under tension by the trigger group the heel will than act as a spring, holding the receiver firmly in place on the stock.
Una cosa che non è stata menzionata è quella qualche volta le gambe di ricevitore contatteranno la nave di linea di scorta e non permetteranno il ricevitore di fare sedere pienamente nella scorta. Rimuova il gruppo di grilletto e veda se questo sta accadendo col Suo fucile. Se è Lei può avere rimuovere la nave di linea di scorta e rimuovere una piccola quantità di metallo dalla nave di linea di scorta per permettere il ricevitore di fare sedere pienamente nella scorta. D'altra parte se Lei ha un'altra scorta, veda se il ricevitore va bene allinei il testo in quella scorta. HTH


English translation of above post.

One thing that has not been mentioned is that sometimes the receiver legs will contact the stock liner and not allow the receiver to fully seat in the stock. Remove the trigger group and see if this is happening with your rifle. If it is you may have to remove the stock liner and remove a small amount of metal from the stock liner to allow the receiver to fully seat in the stock. On the other hand, if you have another stock, see if the receiver fits flush in that stock. HTH


thanks all of you for the good and intersting explenations , Ciao Ric :D
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