question about V2 spring guides

[Jimski]

hello all,
while upgrading my G3 (M41)'s V2 gearbox I noticed that there is a threaded hole at the back of the spring guide for a big screw that hold a plastic part at the back outside of the gearbox.
Is that standard? i.e. will it be present on whatever upgrade spring guide I buy ?
I searched in google images but it's not clear.

thank you!

[Drake]

That hole is what your buffer stock screw will thread into.

The plastic (usually rubber) pad at the back of the mechbox is just a spacer.


And on that note, it's also why if/when you overtighten the stock screw you can pull the mechbox out of alignment (nozzle) and end up with feeding issues and body pins that "mysteriously" become too snug.

[Jimski]

ah, excellent, ok.
thanks!