Rookie407

So I have this raider and I was reading up on modding it when I came across a post where the writer mentioned using the stock as a hidden gun but never went on to mention whether he or anyone else has done it. Nor have I seen it myself after a few hours of searching so I set out to make one. I had the raider and some unknown little orange "DTB".

Hollowed out the grey part of the stock leaving about a half inch lip.

Removed the plunger and barrel from the "DTB".(did usual ar removal and tape on the gasket mod)

Glued the barrel part of the plunger to the tip of the barrel and sanded it done so everything was even and smooth.

Glued that orange barrel to the inside of the stock.

Now what I'm trying to accomplish is attaching the plunger to the blue section of the stock. Is there a way to drill a hole in the back of the plunger and bolt it in place and still keep it air tight?