Alpha 15", Hk Folding Sight –blk 40 - 80 and opens with the thumb

and opens with the thumb stud

Until then

- Lock: Liner lock

- Padded storage box

but to lock it in place

Alpha 15", Hk Folding Sight –blk 40 - 80 and opens with the thumbTroy Upper Receiving Kit, Alpha 15" HK Folding Sight, Black Kit Includes: 15" Alpha Rail No Sight Features: Genesis of modular free float rails Disperses heat and runs cooler than other close to the barrel Comes with two 2" and one 4. 2"detachable rails and all mounting hardware Length: 15" Color Finish: Black Machined from hardened aircraft aluminum with stainless steel components Finished in MIL SPEC hardcoat anodizing Works with standard AR15 M16