I currently have two M70 Fwt Stocks, a LA and SA.
The LA weighs exactly 24.0 oz's. The SA weigh's 25.1 oz's.
I've never had one heavier than 25.1 oz's, and I think I've had 6 M70 Edges. Most were right at 24.0 oz's.
I'd recommend you get a quality electronic scale and measure your current stock.