AR-15 and M16 port covers

[RCS]

something different

[lapriester]

I think the first is a VERY well worn version of the second and the last is a knock off of some kind.

[RCS]

the first photo is the result of an oversized pin inserted to tighten up the small plunger unit and, as why someone would repair or rebuild a port door is unknown but this part was recovered from military salvage and I thought it was kind of different to find and it still could function.

second photo is from a three digit Colt SP 1 Sporter

third photo is a port cover only manufactured in 1982 for NESARD Inc who manufactured AR-15 uppers, as there was a shortage of port covers in the surplus market, these were used in their uppers,
note the simple plunger system, these are mistaken for early Armalite

[RCS]

second photo is not a early Colt SP1

[lapriester]

Well those are certainly different and unusual. Thanks for sharing. I never seen anything like the first and third.