Sorry I confused you for Coast Guard. I hope you understand there was no disrespect to you, the Army or the Coast Guard.
Here are things you should do when trying to fit a GI stock to a commercial receiver:
1. First thing is to check for cracks and ones that may not be apparent to the eye.
A. BE CAREFUL doing this because it is possible for really strong handed person to crack a stock that is not cracked. Not many people can do it, but it can be done. Grip the front of the stock and squeeze inward to see if there are cracks around the sling swivel. Also pull the swivel sideways in both directions to see if the swivel is loose. Try pulling on the ferrule to see it is tight as it should be.
B. Best to do this sitting down. Lay the center of the stock over one of your thighs and press down on each end at the same time. This will cause a crack to open up that your otherwise might not see. Do this on both sides and the top and bottom of the stock, IOW, go all around the four sides of the stock.
C. Check around the void in the right rear of the stock for cracks.
2. Put JUST the barreled action group in the stock without putting the trigger mechanism in place. Now, grab the stock grip with one hand and the barrel ahead of the GC with the other hand. (I do this with the stock upside down on the bench.) Try to pull your hands apart and press them together to see if there is any forward and backward movement in the stock and this USUALLY means how tight the receiver legs fit the stock liner. A good many commercial receiver legs are not as long front to back as GI receivers and that means you would have a loose stock. You can fill up the looseness with bedding to fix it.
3. With the barreled receiver in the stock still upside down on the bench, put the trigger mech in and lock it in place. There must be at least SOME "draw" or pressure to close the trigger guard. If there is not, the stock has to be shimmed or bedded.
4. With the rifle all together, turn it right side up. Look under the receiver heel. There should be contact on the last 1" to 1 1/8" of the rear of the heel.
5. Check the front of the stock. Hold the barrel just above the GC and try to push the stock upwards and side to side. There should be a little movement and stock should spring back after you stop pushing.
6. Point the barrel away from you and check to see if the receiver is sitting correctly in the stock and not canted to one side.
Numbers 1. through 3. Were how we inspected every M14 stock when the rifle was the "As Issue" rifle of the Corps. Numbers 4. through 6. are things we have to pay attention to because commercial receivers often do not fit GI stocks because of the differences in the receivers.