AA 89 KFS 9mm Reverse Stretch Pistol
Atlantic Arms MFG Model AA 89 KFS 9mm Reverse Stretch Pistol. The AA 89 KFS is built using the Original system delayed blowback operated 9mm with a roller-delayed bolt . has the shorter front end with a 6 inch barrel and sports the full sized receiver . This is often referred to as a Reverse Stretch and allows you to install the standard MP5 Collapsing stock or A2 style stock .