Original US Military Buttstock with Trap Door. Used, in good condition.
1960's Vietnam era M16 Buttstocks had fixed Rubber Buttplates (Here)
1970's & 1980's M16A1 models had a Trapdoor. (The Buttstock you are looking at now)
Original Colt M16 part
Made in USA
A1 Trap Door Stock
Under staffed? Customer service 2.5 stars. Ordered grade "A" trap door A1 stock. 5 of 5 stars, used of course, glad to have it.