ACE ACE Arule Stock, Entry Length, Buffer Tube, Lightweight, Does Not Include Spring or Buffer, Black A145B Doublestar-ACE's Ultra Lite AR-15 Entry Length Stock with Buffer Tube (AR-UL) uses Ace's original soft foam overtube for the ultimate cheek weld. A billet machined gusset reinforces the receiver extension tube at its weakest point directly behind the receiver. Precision machined aluminum butt clamps directly to the RET and provides a machined in sling mount. Also includes your choice of .5" or 1" Recoil Pad. Does not include Buffer or Spring.