You need a gunsmith. It might be possilbe or it might not be
The forearm is the front part of the stock, under the barrel, that your NON-trigger hand holds.
usually the stock is behind and the forearm is in front of the receiver.
Best left to a gunsmith
The stock and forearm were traditional wood, but can be other materials. With the AR15 and M16 rifle, they are made from metals and plastics.
Linseed Oil
No known supplier
under the forearm stock
1950's $100
egunparts
No, it will not. Check this website for a 1400 stock and forearm. Under the description it specifically states that it will not fit the sears 300 model. http://www.midwestgunworks.com/page/mgwi/PROD/1400stocks/RAM14111
It is one of the higher grades of wood in the stock and forearm.
Try Mid West Gun Works.