g&p sr16 urx

[eseeweb]

Hi
We have a G&P sr16 for 1/2 a year now. During last game, the buffer tube fall out of the aeg together with the stock and battery. When i brought it home and take a look, the buffer tube is hold on the the body of the aeg with 2 very small screw. I can't find one of it and the other one is stripped.
Anyone has any suggestion on how to fix this? The G&P seems to be different than my old M4A1 from king arms which use a long screw to screw into the spring guard.
We tried to use a couple computer screw to try to lock the buffer tube to the body but it does not work. I am not sure what to do with it now.

thx.