What information do you have on the reliability of an adjustable stock with its carbine buffer and spring in combination with a 20 inch barrel as found on the M16A2/A4. Due to the ubiquitous use of Individual Body Armor and the need for stock adjustability, we may be interested in "going there." Any data or input you have, to include various adjustable stock designs, would be welcome.
MAJ Trevor Shaw
APM Individual Weapons
Picatinny Arsenal, NJtshaw@pica.army.mil