Precision machined from ordnance quality metal and built to interface in shut tolerance with the aluminum stock chassis. For sling accommodation, four integral metal inserts are embedded for QD kind sling swivels (QD swivels not integrated), and can also be Geared up with two regular UM model sling swivel studs. https://sageebrchassis70315.blogdanica.com/29440060/detailed-notes-on-m1a-chassis-kit