Been looking at detachable magazine bottom metal for my Remington 700 long action project. I've found Pierce Engineering detahcable magazine bottom metal with 5 round magazine for $355.00. I've also looked at Accuracy Systems with 5 round magazine for $199.95. Surgeon Rifles is releasing their bottom metal soon, and they have no price yet. Quite a price difference between the 2 I've priced. I can only figure that Pierce engineering is machined billet steel and Accuracy Systems is cast metal. Surgeon Rifles looks like it is machined billet also. Anyone out their have any experience with these? Any good different brands than mentioned above? Pros and cons of detachable magazine bottom metal.