Well i finally built four of my uppers. M4E1 uppers on all four 2 group buy 20" and 2 12" and checked the headspace with PTG go, no go's and from what could see whith the bolts stripped they look like the tolerances are very tight.
A couple questions.
1 does anyone know what lube/CIC they use on these? Smells like otis CLP to me which im sure is rebranded.
2 does anyone know what the red gunk is? Theres a little bit in the ejector spring lube hole. And roll pin hole.
3 has anyone noticed there are two different extractors being utilized on these i have at least one (only stripped two so far) that has "7-2" milled into it on the inside. The other has no markings.. The "7-2" marked one seems to have alot smoother or semi gloss finish im thinking melonite like and the other unmarked one is very flat. Im thinking phoshated.
If i remember ill upload some pics here shortly when i finally get a new pc.
A couple questions.
1 does anyone know what lube/CIC they use on these? Smells like otis CLP to me which im sure is rebranded.
2 does anyone know what the red gunk is? Theres a little bit in the ejector spring lube hole. And roll pin hole.
3 has anyone noticed there are two different extractors being utilized on these i have at least one (only stripped two so far) that has "7-2" milled into it on the inside. The other has no markings.. The "7-2" marked one seems to have alot smoother or semi gloss finish im thinking melonite like and the other unmarked one is very flat. Im thinking phoshated.
If i remember ill upload some pics here shortly when i finally get a new pc.
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