When I cut the stock, I realized it is not solid like wood stocks.It did not have thick wall like norinco stocks.It is hollow with very thin" walls "and it is filled with some softer material.The stock material is very strong but brittle.I am afraid that after prolonged use these "walls "would crack so I gave up on the idea of using GI fiberglass stock.gi fiber wall pic 1.JPGgi fiber wall pic 2.JPG