The SP-A5 Spring and Buffer Kit includes everything you’ll need to
outfit your rifle with VLTOR’s patented A5 Buffer System (aside from a
compatible receiver extension tube).
The SP-A5 Spring and Buffer kit includes:
(1) “A5H2” A5 Buffer
(1) A5 Buffer Spring
(1) Vltor Lockplate
(1) Vltor Castle Nut