This isn't really a pressing question but wanted to know if anyone else has seen this. Buddy brought me another upper to work on......and it came with an R Guns BCG. Yeah yeah.

Anyway this BCG is brand new never fired and I know it has not been tampered with. As per norm for me lately every new carrier I get I sand down the rails with 600 grit sandpaper. Helps smooth the action out a little. While sanding down the left side of the BCG where the carrier & key mate up I noticed it looked like some sort of sealant has been placed between them. In the pic you may be able to see it sandwiched between the two parts. You can definitely see the over run on the rear portion of the key.

Just another observation of lower standard guns. If you need a sealant to keep gas from escaping and can't just rely on the tolerances of each part them that says something.



-Jax