Mounts on a durable custom Receiver Extension tube (included) to accommodate carbine buffers and springs as well as aftermarket A5 buffer systems; Solid "fixed stock" lockup and consistent cheek weld in all positions; 7 adjustments plus fully collapsed for 8 total positions; Adjustment lever requires only gross motor movement to operate yet the entire stock remains streamlined and anti-snag; Enhanced lock mechanism with dual locking pawls for maximum drop strength and shock resistance; Multi-shell construction provides solid foundation and shields critical operating parts from penetration damage; Sloping cheek weld combines a slim profile with user comfort; Storage Compartment in tail of stock is removable and the door is reversible for user preference; Rubber butt-pad offers an anti-slip surface and increases impact protection; Rollover on the toe allows for easier shoulder transitions and better fit when using body armor