Use this stock if you have a shorty M1A like a SOCOM or Scout Squad product Using the shorter barrel. This stock is crafted from a proprietary carbon fiber composite which makes the stock robust still lightweight. The magwell is relieved of fabric so journal variations are speedy. Thank you https://ebrchassism1a38013.blogdun.com/30077294/the-ultimate-guide-to-m1a-ebr-chassis