The AR 15 is a wonderful platform in its original configuration: the 5.56mm round is light recoiling, accurate, and makes for an excellent combat and defensive weapon.

Features: 
JP Enterprises Silent Captured Spring
SCS Buffer Retainer and Spring 
Bolt Carrier Extension
Spacer Shims

Assuming your AR has a Law Tactical Folding adapter, the next challenge is to get a buffer that works properly in a folding setup. This is a captured buffer that was designed from the ground up to work compatibly with the Law Tactical folding stock system. The included captured buffer is exceptionally reliable and will not simply spring out of place, which was a distinct possibility with other buffer systems: the concept of a folding AR is finally coming to practical fruition.