The M16A2 Buttstock is about 5/8" of the inch more time then the earlier styles. As a result of elevated duration it utilised an extended buttstock screw as well as a spacer. The swivel is mounted nearer for the buttplate. This buttstock is currently used on the M16A4: AR15.COM is https://coltpython6forsale22123.arwebo.com/54115103/detailed-notes-on-colt-python-6-for-sale