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Firstly i didn't find the original glitch the credit goes to
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But i believe i am the founder of this variation which makes it a lot easier and 100% success rate ( and a lot better for noobs

)
Requirements
PM-9 hamr scope
any other two handed weapons
Flash,concussion or smoke
Throwing knife for extra fun
perks can be any thing with this method
Note: Don't worry about speed one benefit with this method is u can go as slow as u want i tried waiting 5 secs between each button press and it still worked
1.Switch to pm-9 and look down the default hamr scope
2.hold flash/smoke or concussion
3.click Change weapon 3 times (triangle times 3 on ps3)
4.Click Hamr scope 3 times
5.let go of flash/smoke or concussion
6.stand still
7. glitch will happen every time have fun
For extra fun try step 8
8. press R2 to throw ur knife click triangle ( or just throw it) and you will not be able to see any gun on ur screen unless u use ads but u can still fire it

!
Note this glitch works on every 2 handed weapon in my experience except
riot shield
Launchers
Warning
One time i did this on split screen the kill cam crashed my ps3 so try and avoid killing your other account with the glitch on
If any one wants proof or wants to confirm feel free to PM/Quote me as i haven't time to record it at the mo and srry for the flurry of edits tried to make it as detailed as i could.