m16 full stock gap
 

i have a mk12 mod 0 spr with a m16 full stock and there's a gap between the stock and the body shown here:

http://img51.imageshack.us/img51/900/imga0112.jpg

Anybody know where I can find that little plastic ring that fits in the gap?

you could always get something like this, fills the gap and gives you an extra sling atachment point.
http://www.albertaairsoft.com/store/...id_product=224