Let me make sure first of all, not cock as in penis, cock as in pulling the barrel or whatever back after every shot. Its a bit faster than cocking but definitely will save your ass in several games.
Text tut -
1. Shoot L96
2. Begin the to reload and double tap Y or triangle to cancel the reload
3. Your gun should now be ready to go
Video tut -
This also works with Stakeout and China Lake