Buttstock- Original Colt 604 Fiberglass (Trap Door)
Original US Military Buttstock with Trap Door. Used but 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)
From the 1990's onward the M16A2 also used a Trapdoor, but used a longer buttstock
Made in USA
Note: All three Butt stocks are interchangeable since they all use the same rifle length Buffer Tube (Receiver Extension).
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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.